Regarding Virtual Channels comment.
I referred to what I call "Carrier Channels"
I will give you an actual station WJBK
Virtual channels 2-1 2-2 (not sure if they have a 3)
Carrier channel 7 (note the lack of a dash) this is the frequency they broadacst on. Want to hear somethign funny Just down the road (About 1-2 miles) is WZYZ.. Virtual channes 7-1 7-2 and so on.. YUP Channel 2 took over thir OLD frequency (WXYZ now uses I think 41 but I'm only sure of the forty part)
So when you talk of "Virtual Channels" and I speak of "Carrier" We are actually lookign at the same thing You are looking at the TV channel display and I'm looking at the corrosponding frequency meter.. I'm more frequency oriented because antennas see frequencies .