OPB is Oregon's Public Broadcasting station - our version of PBS {public broadcasting station}.

with analog we only got one channel - now with digital we will get 4 channels of it. {10-1, 10-2, 10-3 etc}

I was hoping the signal thing would be like AM & PM radio signals-
one travels a same distance from the ground and the other goes in angles and bounces -- don't ask which is which cause it's a long time since I read about that...

I'm not really sure about the signal science part of the TV change.

But if you think about so many cell phones and wireless computer signals are flying around and they don't collide or interfere with each other - it has to be because of differing wavelengths or numbers.