Just got my HR10-250 today. I noticed on 2 of my 5 local HD OTA channels when "decoded" by the Tivo box, the signal is to low to retain a constant signal (actually, it goes back and forth from 80+ signal strength, back to 10, then back to 80+ ... seemingly randomly on both OTA tuners). On my new HD sony 50' LCD projection (which has it's own HDTV tuner), all 5 local channels come in great. Has anybody else experienced this? Via process of elimination, I have ruled out a bad connection. Would it be advised that I get an antenna high gain signal amplifier?