Originally Posted by boston_garrett
I'm in Wellesley (2.2 miles from source for WBZ-DT, WCVB-DT) on a large lot with little for the signal to be bouncing off to create the multipath problem. I have no issues at all with ABC but admittadly don't watch/record much PBS. I'm using the Winegard Square Shooter. I have the signal amplified after a long run from the attic to basement head end where the box is located.
Multipath is a tricky fella. It does not respect all stations equally, but is dependant on your location and the frequencies (more accurately, wavelengths) involved. So your reception of WCVB-DT on channel 20 (and WGBH-DT, channel 19) may be significantly different than on WBZ-DT, channel 30, which is 60 mHz higher. Move your antenna by just the right amount and you'll get WBZ fine, but lose WCVB!
I wouldn't look to your houselot for the bounces. It's the really big buildings (and in other parts of the country, mountains) that cause the problems. In your case it could be the Pru or Hancock.
When I was a kid in Brooklyn in the early 70's the biggest disaster for TV reception was the move of the TV transmitting antennas to the World Trade Center. The ghost caused by the bounce off the Empire State Building ruined television for millions of New Yorkers. I remember the dire predictions in the newspapers that turned out to be correct. On the other hand, had the stations not moved, there still would have been a bounce off the WTC, so they were in a bad position no matter what they did. It was good for the cable companies, though.