Fiddling with my rotor today I am able to pick up 13 (NBC - tennis) with only some slight feeeze-ups in the picture, so maybe their transmitter suffered some problems during all the recent electrical storms as well.
I have the antenna as close to 101 degrees (as suggested by TVFool) whereas before it was pointed at about 85 degrees. By tweaking the rotor maybe I'll be able to maintian connections with 13.
I thought I had a UHF antenna put in, but maybe I don't (?). This is the kind of thing I know nothing about. Basically I need help from an antenna guy or installer to make sure everything that can be done, is done, up on the roof.
Thanks for the help Tower Guy; I'll make note of the suggestion of digital channel 26 and see if I can bring it in.