UPDATE: Thanks to those in the VA area that indicated you had been receiving Ch 4-1 (48). We had been receiving it w/ a strong signal until approx. 10 days ago. It then dropped out completely - I had assumed Ch.4-1 was having a problem. This drop out was under 5046. When 5099 came along - same thing. I rescanned local channels - still no Ch. 4. Last night I unplugged the unit for 20 minutes. After powering it up - Ch. 4-1 came in just fine -- but, the channel started to deteriorate (in 10 mins. or so) to the point that the signal dropped out again - not completely according to the meter around 50-60. Perhaps this was just an intermittent problem w/ Ch. 4-1 at that particular time. I choose to power-off the unit (as opposed to unplugging the unit) for 10 mins. - now 4-1 is back - strong and the unit has been on for 12 hours. So, it's either a software problem that unplugging / powering off the unit 'fixed' and/or the hardware has intermittent problems. I would have thought heat could be the culprit -- but I also think after 10 mins. it would be hot and start to act up again -- and it hasn't acted up again. Clearance around the box is good -- it's on top of the stack w/ a cool unit below it and plenty of clearance.
Orig. Post: We have been unable to receive ch. 4 in the DC area for quite a few days now. Anyone know why Ch. 4 is not broadcasting on their HD channel?