I run an a99 on base it has an internal matching coil with adjusting rings. I am amazed, that it works as well or better than many ground planes I've had. except for the Super starburst I had in the early 70s. [ first wife kept that one] I'll keep you posted on my little adventure . retired and getting cabin fever . Funny no one has heard of the elevation thing but me and some older radio heads. might be BS