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Old 30-Oct-2020, 7:05 PM   #18
Tower Guy
Senior Member
 
Join Date: Dec 2009
Location: Delmar, NY
Posts: 1,236
I would not bother trying a single antenna. The ATSC spec says that reception must work when the undesired adjacent channel is 30 dB stronger than the desired channel. In this case WCAX is 70 dB stronger. The azimuth difference between WCAX and the two Canadian stations is 85 degrees. Therefore, awright would need an antenna with a 40 dB front to side ratio. The patterns on the Antennas Direct web site show 20 dB front to side ratios on their 91XG and DB-8e on channel 20.

The solution is two antennas stacked one above the other but offset by 1/2 a wavelength, creating a deep null 90 degrees off axis. When installing the antenna, the trick is to null WCAX, not maximize CBC.

Where I grew up we always watched Hockey Night in Canada. I hope awright can too.

Last edited by Tower Guy; 30-Oct-2020 at 7:12 PM.
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