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Old 30-Mar-2011, 3:51 PM   #5
ADTech
Antennas Direct Tech Supp
 
Join Date: Jan 2010
Posts: 2,932
Quote:
I'n not sure why John is suggesting the all-channel antenna.
Seems to be a pattern with that recommendation regardless of the intent of the requester. The only thing on low-VHF in the Los Angeles area is a Spanish language Franken-FM on channel 6. You can listen to it on any FM receiver in the area.

Quote:
very likely reflections that add up in the wrong way for KCBS's frequency.
Bingo! The current location is in a spot where multi-path is clobbering that one frequency. The solution is always one of the following: 1) Relocate the antenna to a different spot and try again or 2) Select a narrower beamwidth antenna and see if it nulls the offending reflection. Advanced users might try combining another antenna to create a steerable null, but we don't offer such assistance in setting up such a project. Ken Nist's HDTVprimer site offers some examples.

The DB4 is classified as "multi-directional" because it has a modestly wide beamwidth which usually allows for a less than accurate aim to work or which may allow adequate reception from towers that are spaced out rather than from a single direction as is the case with Mt Wilson.

PS. I get this situation at least once a week from callers or emailers. The above advice has been correct in every case for which feedback has been provided.
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