View Single Post
Old 11-Sep-2014, 8:04 PM   #4
tomfoolery
Senior Member
 
Join Date: Oct 2013
Location: Rochester, NY
Posts: 207
Before digital, the analog broadcasts were mostly on the two VHF bands, low-vhf channels 2-6, and high-vhf channels 7-13. UHF was 14-83, eventually chopped back in steps to 14-51. When digital tv transmissions started, stations continued broadcasting analog on their existing channel, and they added digital broadcasts mostly on UHF channels, but the screen displayed the same channel number they've always used (with the added decimal, like 3.1, 3.2, etc.), now referred to as a 'virtual channel'.

Once the analog transmissions were permanently stopped, many stations moved their digital transmission to the channel they had always used for analog, but many (most, really) stayed on the UHF channel, with the virtual channel number remaining where it always was, with the addition of extra channels (like 3.2, 3.3, etc.) all multiplexed onto the same signal. This also allowed them to keep the same identity, like "News 3 at 11:00", and stuff like that. A few are using low-VHF, but not many, like WBKP on Real 5 in the gray in your report.

But your antenna receives the actual broadcast frequencies/wavelengths (the "Real Channel" in the TVF report), regardless of what channel the television and station identify themselves as (the "Virtual Channel" in the TVF report). So you need an antenna or antennas that receive the broadcast "Real" channels, which in your case are all high-VHF and UHF. Channel 3.1 WJMN (CBS affiliate) is broadcast on real channel 48, so it requires a UHF antenna with enough gain to bring it in cleanly. With a low NM value and 2-edge condition, it's going to take a big antenna, like the 91XG or DB8e, but given the wide angle between it and the other group at around 29 deg. magnetic, the DB8e with the panels aimed apart a bit may be the best bet. That would require a dedicated h-VHF antenna to get real 8, 10, and 13, and I would aim it at 29 magnetic, hoping to get 8 off the back, since it's the strongest.

Combine them with a UVSJ.
tomfoolery is offline   Reply With Quote