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www.k0bg.com and read the sections on mounting, grounding and bonding. Once you have you'll see the reasons why yours isn't working.


Any mount that doesn't have horizontal metal directly underneath it is going to give you a poor experience. Also as others have said, having vertical or near vertical metal shadowing the antenna, such as the door frame, is going to seriously affect tuning.


Unfortunately as time goes by newer trucks are getting harder and harder to install CB antennas of any decent length and have them work worth a damn. When I started truck driving 25 years ago I drove a 10 year old truck and it was simple then as it was a low height cab so it was just throw a 5ft antenna with a stainless steel whip in the middle of the roof and happy days. 20-30 miles on stock power was no problem, the lower height meant your antenna wasn't smacking overhead objects all the time.


If you're willing to get a drill out and drill a hole in the roof of the cab to install a fixed mount even a short 3ft antenna which I normally wouldn't recommend to anyone will work much better than you trying to use a 5/6ft one where you're currently trying.