I have been trying to narrow down the tvi issues I have with my ground mounted vertical. The antenna is 37' from my house and the radials consist of 21 at various lengths from 15' to 52' long, basically as long as I could make them to fit my 40x60' backyard. I have replaced all my coax with rg-213 and installed a balun designs (#1115) 1:1 isolator balun prior to my ldg z11pro which is installed in a ammobox for water proofing. My problem with interference on the tv's in the house is limited to only 15m (21.070) on both tv's and 20m (14.070) on the bedroom tv. My question is that of radial length and their possible effects on creating tvi. Could I be having problems due to a few radials being close to resonant length on these two bands, I'm pretty new to all of this and have been either replacing or rearranging things to overcome this issue without much improvement. As far as radio, im using a kenwood tx480sat and a max of 50watts output, most of the time I'm doing about half that. I also am using a Direct Tv dish.