Thanks for the pointer Dave, but I doubt that this is the explanation. The Philly ABC station was always weaker than WHYY, but I still get ABC. Also, I believe that they transmit from roughly the same location. So if the environment is the culprit, I would expect ABC to be gone before WHYY. Right now, WHYY is not even intermittent - just plain missing.
Are you sure you have your antenna pointed properly? I'm in Freehold, which is probably farther from Philly than you, and I'm getting 92% signal on my Dish 6000 with a Radio Shack Yagi in the attic. The site www.antennaweb.org was very helpful in determining exactly which direction to point the antenna.
WHYY-DT55 has been and continues to operate at normal power (87KW ERP, 800', Phila. Antenna Farm) with the exception of the maintenance outage that Pete Putman kindly posted in this thread. The DTV transmitting system was recently recalibrated and everything looks good.
Reception changes have been occurring throughout the area as the foliage change take place. Some viewers are reporting increased signal levels, some no change and others are having problems. WHYY has no immediate plans to increase power.
Hopefully, the pending Comcast carriage announcements will offer an alternative - albeit, at a price.
Distant reception would improve with my increased transmission power, but closer in reception may not directly benefit. Many of the receiving problems are associated with the reception of multiple reflected signals and not necessarily power related.
Slight receiver antenna reorientation may correct the situation.
I've had the exact same situation with WHYY and other HD stations that take the signal off the air for any length of time. My guess is that you are probably using a DTC100. If so the fix that corrects this for me (so far 100% of the time) is to perform a quick scan of the OTA stations - my guess is that once you complete the scan WHYY will return in all of its glory.
My thanks to Bill Weber and his staff for helping me to find this fix several weeks ago.
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