The devil, as they say, is in the details, many of which are important are missing.
1. Which Winegard? They have two generations of RV antennas, very, very different. One is very good on VHF but lousy on UHF, even with their slip-on attachment. The other is fair on UHF but lousy on VHF.
Sensar RV-2005
2. Which stations are received by each? Not "channels" since that count is usually inflated by the presence of several sub-channels that are all part of the same station broadcast.
RV- 9, 11, 13, 16, 20, 28 (and at one time 7, 33 and 64)
4-bay - 9 (weak), 11 (weak), 13, 20, 28 (weak)(never 7, 33 or 64)
3. Which preamp is on your home made 4-bay antenna (please don't call it a "DB4", we already have dibs on that term).
ONN, model ONA16AV004 (believe that to be the model)
4. What design was used for the 4-bay? The homemade 4-bay antennas are UHF designs, and some of them are lousy designs to start with.
like this: http://akschaefer.com/wordpress/wp-c...12/Picture.jpg (not mine, but same style). I have not yet installed any reflector on the 4 bay yet
5. What direction is each antenna facing?
I have rotated both 360 degrees, best reception facing NE (I would guess about 15 deg)
6. What, if anything, is out in front of the 4-bay antenna? Trees, building, etc?