On 11JUN09, I got lots of DTV signal. On the afternoon of 12JUN09, I had basically nothing. So I re-scanned the TV ... and it found more signals than I had before.
Re-scan your TV.
Some channels moved. At 11:59 pm last Fri night, WHDH-TV 7
in Boston had an analog signal on Ch 7 and a digital one
on Ch 42; then they switched them both off and powered up
the digital signal on the frequency of Ch 7.
They soon found that many people who could pick them up on
Ch 42 couldn’t pick them up on Ch 7! They’re saying the FCC
didn’t allocate them enough power. So for now they switched
CH 42 back on (with FCC permission) and are trying to get a power boost for the Ch 7 digital frequency.
The FCC and other sources are saying you should re-scan
Some are even saying unplug antenna from your TV. Unplug
converter box, etc. Then plug everything back in and
rescan.
Also: your antenna may not be adequate enough.
Some complaints have come in about Channel 6-es in
Schenectedy and Phila. Also some complaints about
stations putting their signals on “VHF-Hi” (i.e.,
channels 7-13; VHF-Lo is 2-6)