My tube modulator is shown here:
http://videokarma.org/showthread.php...ighlight=build The sound mod does work, but it is finicky IIRC (been a while since I worked on it), some sets like it others don't...I can tune the mod so some sets that have sound alignment issues sound good again.
I favor 3 families of Blonder Tongue modulators. AM60-series (agile) AM40- series (agile), and BAVMz series (fixed channel, but available in most all channels). I use those with custom made tuned dipoles to wirelessly transmit. I use a method shango66 on youtube uses in a video (minus the fancy SWR meter). The BAVM and AM40 cover the property well, and the AM60 can cover the whole block. I have probably 50-100 TVs spread through the house such as in my bedroom, adjacent display room, basement, often in the garage, and sometimes elsewhere...So hard wiring all my sets/getting wired signal to them is not a very practical endeavor. If you go wireless make sure you know the carrier channel of every DTV station you can receive, and don't use those carriers so you don't interfere with anyone, and no one interferes with you.