Posted by LJD on December 11, 2011 at 18:38:06 from (67.142.130.27):
In Reply to: OT-digital TV reception posted by Nancy Howell on December 11, 2011 at 09:56:00:
Here's a sample of a free signal map you'll get at TV Fool. Top to bottom are the strongest to weakest TV channels. If you look under column "NM(dB)" that is the signal strength of each channel. The lower the number, the stronger the signal. Anything up to 22 NM(dB) should come in well with the correct antenna an amp. Up to 30 if you use some very good equipment.
You will also see each channel with the "real" channel number and the "virtual" channel number. In reality, the "real" one is the fake one, and the "virtual" is the real one. Yeah, it's confusing. But, to know what antenna you need, you must look at the "virtual" to see what band it's really on. A favorite channel 7 might of been on VHF a few years ago, and now -even thought it's still called "channel 7", it might actually be on channel 23 which is UHF, not VHF anymore. You must know this to get good reception.
A good preamp is very important. Not an amp on the ground or in the house. The amp needs to be on the antenna. A ground or house mounted amp can only offset line loss but cannot regain a lost signal up on the antenna. You can buy a good preamp for $30 with no power wires needed to be added (powered through the RG6 or RG11 coax).
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