[Jeffhs]

I figured as much, that you might have been using an RF modulator fed by a cable box. Do you have an in-house type of system similar to the one Kamakiri (Tim) in Buffalo uses for his antique TVs? Since Orlando only has three VHF network TV stations (not counting PBS, Fox, et al.), you wouldn't need that many modulators to build a good local distribution system. I think Tim only uses one and changes the input signal at the modulator, depending on what channel he wants to watch. The modulator's output is on channel 9 in his installation, but since Orlando has a local channel 9 any modulator you use would have to output to some other VHF channel.