there is a grab handle on either side of the back of the cab and a small L shaped bar behind the drivers side with the hoses and electrical line hanging off of it. i picked up a 4' fiberglass antenna yesterday it had 9' of coax and a clamp with it. i tryed to put it on the grab handle since there isnt enough cable to reach the other piece. unfortunately i couldnt mount it right because the clamp was designed for a mirror and not an upright mount. i did have it on for a little while but it was angled back some. i had the same problem with that antenna as with the rest i tryed. it would kick the antenna warning light on, this time from channels 1-18. i got tired of having this issue and said the hell with it, i dont know if it is a radio or antenna problem, butit seems odd that i would have the same issue with four different antenna attempts now. i returned the radio yet again and got one that i know is very popular and i used to have in the past, a cobra 29ltd classic. i hooked it up to the mag mount on my own vehicle on the way home from work and it seemed to work perfectly. i calibrated it the best i can with the built in adjustments. i did it as the directions say, set to calibrate, key the mic and adjust till the needle is on the mark, then switch to swr while still holding the mic and see what it reads, repeat for chanels 1/20/40. i did this and each time i switched to check swr the needle bottemed out. the lower the reading the better right? oh, and no antenna warning light. also i picked up a new mounting bracket so i can put the fiberglass whip on the grab handle the right way.