Thanks for the detailed reply. Just for fun I plugged in 500 for the AGL value and WGPX comes in great with it that high. I wonder what the neighbors would think if I mounted a 500 foot tower in the yard
. In all seriousness, couldn't get much over 10dB even with a 12 foot above rooftop tower according to the report.
Anyway, thanks again for all the helpful advice, especially John Candle, Scott, and GroundUrMast. I really appreciate it.