About how much range should I expect to get out of that radio with the A-99 if I put it on a 20' stick of pipe? that would put the top of the antenna approximately 37' high.
This pretty much describes my antenna. For local propagation (y'know, like all legal and stuff for CB), 25 miles on SSB, 10-plus miles on AM is what I'm getting.
Using the same antenna for 10 meter ham (it has very similar propagation characteristics as 11 meter CB) at 10 watts & SSB, it's easy to skip out 1000+ miles. Cranking up the power to 100 watts, it'll hop the Atlantic on a good day.
I'm sticking with the 21' chainlink fence top rail with guy ropes, because when you get much longer than that they get all floppy when you go to put them up or pull them down. A friend went to 30' and that turns raising/lowering into a two-man operation. 21' is about all that I can handle solo.
One other trick is to add about 4' of PVC at the top of the pipe to electrically isolate your antenna. This eliminates DC & low-frequency ground loops, and may even help a little on HF isolation. (In retrospect, it may have been easier to do this at the bottom of the antenna... I'll remember that when I revamp things this spring.)