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« on: June 27, 2017, 0022 UTC »
Tree companies and paving/road construction companies seem to make heavy use of CB around here as well. There's one that has trucks with two antennas on each, one for CB, and the other for their 43 MHz band business radio service system. Since they often work with other contractors/sub-contractors, having CB makes sense. Same with the state department of transportation operating their own 47 MHz system, having radios for the VHF high band state police Project 25 digital trunking system, scanners of various types and a mag-mount CB antenna on some trucks for good measure - so the snow plow guys can talk to the truckers.
The roadside assistance trucks all have VHF low band (45/47 MHz), VHF high band (digital trunking), 700/800 MHz antennas (vehicle repeaters for digital trunking) and a hodgepodge of various CB antennas. Some of them have dual ball-and-spring antenna mounts (one for a VHF low band antenna, and the other on the opposite side of the truck for a CB antenna).
I've seen 4 foot fiberglass coil antennas, 60-70" base-loaded whips, Wilson 5000 trucker antennas, and 108" stainless steel 1/4 waves opposite the VHF low band antennas. With all those antennas combined with VHF-high band and scanner antennas...one wonders what the radiation patterns for those types of setups are.
I even remember seeing a military convoy driving down 95 and the lead humvee had a Wilson 5000 CB antenna slapped on the roof (as well as VHF FM SINCGARS antennas). Interoperability, yo.