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Old 18-Jun-2017, 5:46 PM   #3
ADTech
Antennas Direct Tech Supp
 
Join Date: Jan 2010
Posts: 2,865
Since he's less than 10 miles from his VHF stations, it's not surprising at all.

While we might occasionally suggest trying a UHF antenna in strong VHF signal locations to see if it might pick up local VHF signals, it's not something that is predictable and is not something that we will specifically recommend with any expectations. The results will be potluck.

Any antenna, when used for out-of-design-band reception attempts, will usually be very near-sighted and the reception patterns or directions will usually be at odd angles to designed performance. One example of this can be seen if one looks at the UHF patterns of our ClearStream 5 in its data sheet. For example, on UHF 35 or so, the thing is somewhat nearsighted straight ahead but has lobes on both sides of boresite.

As another example, the DB4e has a fair amount of reception about 30 degrees left of boresite on the upper VHF channels but doesn't have a corresponding reception lobe to the right of boresite.

Complicating the assessment is the UHF balun used on our outdoor UHF antennas which allows the coax shield to be used as a reception element for VHF via feedline radiation. Since the routing of the coax by any given customer is going to vary from one customer to the next, expecting this mode of reception to work usually isn't realistic. Due to this, it is our firm recommendation to customers that, if you NEED VHF reception, you should PLAN for it instead of relying on chance or unpredictable methods.
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Last edited by ADTech; 18-Jun-2017 at 5:52 PM.
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