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You need an scfm series modulator from Logenex. They make the only one that works with digital cable. Go to logenex.com and they can sort it out for you. It is very simple.

You can do it but you need to use a Logenex SCFM modulator and may need diplexers or just regular splitters. It works a treat but it is not cheap. Probably around $400 to $500.

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The problem with the crappy picture is either due to noise or the wireless signal is just not strong enough to transmit the images. Not too much you can do.

If you want to modulate with digital...