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At a 40 or so foot length, if they weren't 75 ohm cables, he'd have video issues. IOW, try estimating the length of the signal from the frequency that you're using and then compare that value to the length of cable being used.

Ummm...no. What you do is make a stab at determining what the bandwidth of your cable is and compare it to the bandwidth that you need times 3. If your bandwidth exceeds your needs, then you're in 'the zone'. Your dealer should have this information. If not, he may have the diameter or effective...