- VHF Multi-band Frequencies: 50 - 60MHz Quarter Wave | 144 - 174 MHz 5/8 Wave
- Handles up to 500 Watts
- 53" Length

Opek Technologies
- HF / VHF Multi-band
- 200 Watts Max Power Handling
- UHF Male (PL-259 Connection)
- 136-174 MHz Frequency Range
- NMO Connection
- UHF 430 MHz - 450 MHZ
- NMO Connection
- Dual Band: 144-148 MHz ( VHF BAND ), 440-450 MHz ( UHF BAND )
- NMO Connection
- Rated to 150 Watts Power Handling
- Dual Band Base Station 2M/70CM Antenna
- 144-148 Mhz, 440-450 Mhz
- Gain: 2m 9dB, 70cm 11dB
- UHF Antenna Connection
- PL-259 Coax Termination
- 136-512 MHz
- Common lengths to cut to: 18" @ 144 MHz (2 meter), 16" @ 155 MHz (Marine), 4" @ 440 MHz (70 cM)
- Requires UHF Mount (sold separately)
- 3 Positions
- N Female Connections
- Covers the 2 meter band
- High Gain
- Breaks down into three pieces
- Handles up to 60 Watts
- PL-259 Connection
- Attaches to a trunk, hatchback, hood, or door lip
- Tilts and rotates to accommodate most slopes
- Antenna Stud For 3/8" x 24 Thread Antennas
- 8.2' (2.5M) Height
- 144 - 148 MHz (2M) / 430 - 450 MHZ (70cm)
- 200 Watt Power Capacity
- 3 Position Rotary Switch
- SO-239 (UHF) Connections
- Use for One Radio and 3 Antennas OR 3 Radios On One Antenna
- Noise Cancelling
- Mute Switch
- Magnetic Base
- 2 Positions
- UHF Connections
- Multiband: Covers 80 / 40 / 20 / 15 / 10 / 6 / 2 meter and 70cm
- UHF Connection
- Retractable Telescopic Whip for Improved Tuning
- 3 Positions
- UHF Connections
- Attaches to any vehicle window
- SMA Female Antenna Connection
- 8' Cable with SMA Male Termination
- Cut to Tune from 136 - 174 MHz
- Magnetic Base
- 14' Coax Cable
- 450-470 MHz
- NMO Base (mount not included)
- 5dB Gain
- 2 Postitons
- N Female Connectors
- Attaches to a trunk, hatchback, hood, or door lip
- Tilts and rotates to accommodate most slopes
- Antenna Stud For UHF (SO-239) Connections
- Attaches to a Trunk, Hatchback, Hood, or Door lip
- Tilts and Rotates to Accommodate Most Angles
- Mount Only
- Attaches to a trunk, hatchback, hood, or door lip
- Tilts and rotates to accommodate most slopes
- Antenna stud for NMO antennas
- SMA Connectors
- Mini 1.5" Magnet Base
- 8.2 ft Thin Coax
- Compatible with all vehicles
- Usable with Magnetic Mounts Up To 3.5"
- NMO Mountable
- Cut antenna to operate anywhere between 136~960 MHz
- 17' RG-58 A/U Coax Included
- Universally compatible with any NMO antenna
- PL259 connector on cable
- Frequency:140 - 160 MHz (VHF) 420 - 460 MHz (UHF)
- Impedance: 50 ฮฉ
- Power Range: 0-200W
- Attaches to the window of any vehicle
- 3/4" Diameter Opening
- Stainless Steel
- NMO CB Antenna Adapter
- NMO TO 3/8 in X 24T ADAPTER
- Overall Height: 1in (26 mm)
- OPEK NMO3 (F) PL-259 to NMO Antenna Adapter
- OPEK NMO 8 (F) PL-259 to NMO Antenna Adapter
- COAXIAL LIGHTNING SURGE PROTECTOR
- UHF FEMALE to UHF FEMALE
- This is a superior 3 dB gain 5 feet antenna.
- Operates on all USA and international VHF marine frequency.
- Extended frequency coverage to 162 MHz for NOAA 162 MHz weather reports.
- This will NOT work with CB radios!
- This is a lightning arrestor for "N" style connections commonly found on HAM radio equipment
- The CB version is found here CB Lightning Arrestor
- Frequency: 26 - 30 MHz
- Max. Power: 2,000 Watts
- AM Carrier: โ , AM PeP: โ, AM RMS:โ, FM: โ , SSB: โ
- Two Adjustment Points to control the angle of the antenna
- Trunk / Lip Mount
- No Stud - 16mm mount hole for UHF antenna connections
- 3' VHF Marine Antenna - 3dB Gain
- Specially designed for use on Fiberglass Boats
- Complete With An L Type Mounting Bracket & 15ft Cable
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Complete your Opek Technologies setup
- 50' Long
- Includes 2x PL259 Connectors Pre-Soldered
- RG8U Cable
- 6 feet Long
- PL-259 connectors
- HF ~ 450 MHz Operation
- UHF Mirror Mount for Amateur (HAM) Antennas
- 3ft Coax Jumper
- Typically Used with Meters and Amplifiers
- PL259 to PL259 Connectors
- Dual Band - 2 Meter / 70 Centimeter
- 3 dB Gain on 2M, 5.5 dB gain on 70 CM
- Fold-over
- 3ft Coax Jumper
- PL259 to PL259 Connectors
- 50 Ohm
- 5', 1 1/4" Wide Antenna Mast
- Can be linked together to create a longer mast
- Commonly used as a mount for base station antennas
- Gain: 6dB - The Most for Mobile
- 5/8 Wave Antenna
- 32 Inches in Length
Opek Technologies questions
Is there continuity between the outer barrel on the SO-239 and the inside threading on the NMO?
Yes, verified 9/16/2024 that the SO-239 outer barrel has continuity to the bottom NMO threaded side. The center conductor has continuity as well.
How do I check my SWR using this meter?
1. Turn the transmitter of and disconnect the antenna coaxial cable at the output.
2. Connect the SWR-3 โTRANSโ connector to the transmitter output, and โANTโ to antenna connector. As short cable equipped with male connectors on both ends will be required between the transmitter and the meter.
3. Set the slide switch to โSWRโ and โFWDโ. Rotate the โSET & FS ADJโ counterclockwise to near minimum position.
4. Turn the transmitter on, rotate the โSET & FS ADJโ for full scale, โSETโ position on meter.
5. Next, set the slide switch FWD/REF to โREFโ and read the meter scale. The meter will give the SWR reading directly.
6. A 1:1 ratio is the ideal match. Adjustments on the antenna system should be made so that the SWR is as low as possible. A SWR of 2.0 is considered satisfactory, taking into account the line losses and slight mismatching. The operator is referred to the numerous articles in radio magazines and books dealing with various proper matching methods of different types of antennas. NEVER attempt to adjust the set to the antenna.
7. The power required for the SWR bridge operation is dependent on the frequency; about 25 watts of 3.5 MHz, 15 watts at 7 MHz, and proportionately lower power at higher frequencies. If the transmitter power is not sufficient and a full meter swing cannot be achieved, adjust the antenna system for the lowest possible swing at the โREFโ position of the slide switch.
How do I use the meter to read RF Power
1. Connect the SWR-3 โTRANSโ connector to the transmitter output, and โANTโ to antenna connector.
2. Set the slide switch (SWR, PWR) at POWER position, and set the range slide switch (FWD, REF) to either 10 watts or 100 watts position, whichever is suitable.
3. When the transmitter switch is on, the meter needle will deflect. Read the amount of deflection on the top scale. If the range switch had been set to the 100 watt range, the value is multiplied by 10.
4. For accurate power reading the SWR-3 should be used in circuits having SWR value of up to 1.5. The meter accurately will decrease if the SWR value exceeds 1.5.
5. Always have the meter switched off when removing this meter from the circuit.
6. NEVER disconnect the โANTโ connector when transmitting. The abnormal voltage generated may damage the transmitter.
How do I use the SWR-3 as a field strength indicator?
1. Set the slide switch to โSWRโ and โFWDโ
2. Fasten the bar antenna to the stud on the side of the case.
3. Bring the SWR-3 in the vicinity of the transmitter of antenna system with the transmitter in operation. Be careful that the pickup antenna does not come in contact with any metallic portion of the transmitter or antenna.
4. The adjusting knob is rotated to obtain a convenient reading on the meter.
5. After the aforementioned steps have been taken, any adjustments performed on the transmitter or antenna will be reflected by an increase of decrease in the meter reading.
Why buy Opek Technologies from Walcott Radio
- 30-day hassle-free returnsChanged your mind? Send it back within 30 days.
- Fast shippingMost orders arrive in 2โ3 days from our Iowa warehouse.
- Real radio peoplePhone and chat support from staff who install this gear every day.
What customers say about Walcott Radio
So my Stryker I had received for Christmas is truly phenomenal, and just as I had hoped it performed flawlessly from the box. I had a few changes that needed made for antenna height, and location the best bracket. Within an hour of email each question I received timely responses with guidance/links where to find what I was looking for. A coworker and friend of mine recommended using this company for my radio needs, and they certainly did NOT disappoint. I will forever recommend them not only for their prices, their product, but also for the ease, assurance, timing, and excellent professional staff that have assisted me with any and all questions. My hats off to y'all, and I definitely hope one day I'm out your way to visit the shop and thank y'all in person! 5 stars isn't enough, but it's all I've been given as an option. Y'all deserve 50 stars!
I am a repeat customer for a reason! There are hundreds of places to buy radio equipment/accessories from but Walcott is my go-to because they are an honest and trustworthy site. Recent purchase was for a couple Stryker rigs with some bulk repair accessories and once again, the folks at Walcott came thru with another A++ transaction. Even with the custom tuning I requested, the units shipped on the 2nd day and arrived the next day in a well secured package and in fine shape. I have zero complaints and everything is working as it should. Will continue to use Walcott as a supplier of new equipment and especially for their fair priced, quality repair & upgrade components. These guys are way more than just another online CB retailer, much more!
All I can say is WOW, I remember venturing into this shop when they were a small but well recommended by fellow truck drivers on the road, many years ago. I am still impressed, they have grown into a great company and have many more things to offer. I ordered a GMRS antenna kit for my 24 Ram and the shipping time was quick. I will continue to be a customer, these folks are still at the top of their game in my book!!!
I ordered a President George cb radio on Monday, it arrived Wednesday. Well packaged, free shipping. Today (Thursday) I ordered a Stryker antenna, and got an email saying it had already shipped and will be delivered Saturday. Their response to orders is impressive! I was told that this cb/antenna combo is one of the best. I am impressed with this company so far, and I have read nothing but good reviews on them. I will definitely use Walcott Radio for anything I need down the road.
The shopping experience is about as easy as tying your shoes. Didn't have one problem and received a very fast reply back to numerous questions in emails, ONLY 3 days ship time from Iowa to Texas including purchase day. Radio works great and new owner very happy again. FANTABULOUS..!! Beyond 1st class customer service and then some, thanks to all at Walcott.!
What a great experience! Could not believe how fast my radio was shipped. Ordered a President McKinley with the power mod and it works so much better than my stock McKinley. Dead key is about 3.5 lowest and pep about 25 highest with a good forward swing. My other McKinley stock would only put out 13watts pep with backward swing Hope this review helps someone else with their McKinley. What a great base and mobile radio!
Discontinued Opek Technologies products
8 models ยท 5 have a replacement
Still running one? Each card links to its product page and to what replaced it.
| Antenna Connector [mount] | — | New NMO |
|---|---|---|
| Antenna Mount Application | — | New Car ยท Pickup |
| SWR Meter | Yes | — |
|---|---|---|
| Power Measurement Types | — | New AM (Average/RMS) ยท FM (Average/RMS) |
| SWR Calibration | — | New Automatic |
| Frequency Range | — | New 140-150 MHz ยท 430-450 MHZ |
| Power Measurement Types | — | New AM (Average/RMS) ยท FM (Average/RMS) ยท SSB (Peak) |
|---|---|---|
| SWR Calibration | — | New Manual |
| Frequency Range | — | New 1.8-200 MHz |
| Illuminated | — | New Yes |
| Power Measurement Types | — | New AM (Average/RMS) ยท FM (Average/RMS) ยท SSB (Peak) |
|---|---|---|
| SWR Calibration | — | New Manual |
| Frequency Range | — | New 1.8-200 MHz |
| Illuminated | — | New Yes |