Flat stainless steel pickup truck stake hole mount with UHF stud, specifically designed for Amateur (HAM) antennas. Offset design allows you to still utilize a topper while moving the antenna away from the body.
Workman Electronics SH4UHF Summary
UHF Antenna Stud
28in Ground Wire
15ft RG58 Coaxial Cable w. PL259 (UHF) Connector Pre-Terminated