Will This Work? - Try This Simple Test! While hearing the noise you want to filter, unscrew and unplug the coax antenna cable from the back of your radio (don't transmit!). If the noise is still there, the filter should work. If is goes away, you are receiving noise as a signal.
Remove unwanted static / noise / squealing from your system with this in-line power line filter. Rated up to 15 amps continuous (20A peak) and functional up to 20VDC this will work with most radios that have less than 100 watts output.
PLF1520 Features
Installs between your CB radio or car stereo and DC power supply to filter out line noise & reduce electrical interference