Originally Posted by LithOTA
If OTA is all you have, Rockford is pretty limited. Madison has a lot more, and it's definitely worth a try. If you can spin the antenna to the north and get all of the Mads, and still have the Rockfords, you'd have over 20 channels.
FWIW, I have a DB-4 UHF antenna on a mast on my roof. Last week I pointed it at Madison instead of the TV towers to the west of Rockford. I usually still get Rockford channels 17 and 23 off the side of this antenna -- and now also receive Madison Channels 3, 21, 27, and 47. Because the antenna is pointed at Madison the reception on its channels is about 90% stable and predictable. Local Rockford channels 17 and 23 are only 60% predictable and stable off the side of this antenna. It is my opinion that the transmitters from the Madison stations produce a better picture, better detail and colors, and obvious better sound.
I have a separate VHF antenna up on the roof for local channel 13 (NBC). It is a 5 element Yagi designed to receive channels 7-13. Its reception of channel 13 is 100% stable.
Several of the Madison channels have 3 sub-channels, not just 2, albeit these sub channels show low value old stuff, just as the sub-channels do on local 13, 17 and 23 channels.
Tomorrow I am going up on the roof again to move the UHF antenna up to the very top of the mast (where the channel 13 antenna is now located) to determine if an additional 6 feet in elevation is enough to improve reception both of Madison and local channels off the left side of the antenna.
Moving the VHF down a few feet to a lower position on the mast should not make a difference as it receives channel 13 so well with apparent good signal strength. So far I have not noted any interference between these two types of antennas which each have their own separate downleads; then their signals are joined in the basement with a UHF/VHF signal combiner to provide just one cable at the wall plate for TV set connection. I've tried VHF and UHF reception with/without this combiner and note no apparent difference. The combiner presents very little signal loss it seems.