[TowerTalk] Radial screen under roof-mounted Yagi?

[Tony AI9X]

Hello all,
  I was wondering if it would be worth building a radial or ground 
screen under my tripod mounted TH2 about 11 above the roof peak. Total 
height of the antenna is 26 feet and I want to reduce the RF getting 
into the house. Thought maybe it would either absorb some stray fields 
or even affect the pattern like it was higher up. I know that this list 
is mainly tower owners, so thanks for any help. Beam is mounted on two 
5' masts with rotor between on a 5' tripod - all are bonded together 
with #8 wire to a SPG.

Thanks,
Tony, AI9X