Having watched digital HDTV for 5 years now with a 177" super log periodic fixed antenna fades can be very annoying as the sound and picture blurp to nothing then return a few seconds later. Fades can be short or long in duration and with intermod can be "stacatto" driving you clean bannanas. They can occurr at relatively strong signal strengths depending on weather conditions, path conditions (trees, buildings, towers), transmitted power output, and receiver sensitivity. The signal strength meters in your TV's are heavily damped so you will not see the "quickies". Most of my local stations are pretty solid but some of the cheapies drive you nuts. The AVS forum had the official tv station radiation coverage graphs for my location which was very interesting. Sometimes "ducting" can reak havoc with some digital channels interferring with each other if you happen to be re-channelizing your tuner. This happened to me with some digital channels 200 miles away. The tuner did the typical"Three Stooges" act. I said to myself "Holy Toledo". (The offending digital stations were from the Toledo area).
Confuscious say: "Get big antenna, good lead-in, or get Cable/Sat guy to install stuff".
JJK
K-horns 1965, Cornwall 1965, RSW12 2004, SC-1's 2004, Denon AVR-983 2004, DRA-365R 1998, Hughes AK-100 1985, Yamaha EQ-70 1985, Technics SLP-100 1985, JVC-XV-S500BK 2003, Kenwood KD-64F 1985, Sony KDL-46XBR2 2006, Dean Crossovers, CT125 tweeters, MDL-120 Computer HD card 2003, Key Digital KD-SW4X1 Component Switcher, Sony KLV-S23A10 LCD TV, JVC SRDVD-100U Player, Sharp 32GP1U, Toshiba HD-A35, Sony KDL-37XBR6.