Rick,
IT really all depends upon the kind of signal.
If your sending this as composite Video, anything really over 50' will start to potentially ghost & get fuzzy.
If it was me I would use the X-10 Transmitters. While you don't have to go wireless, you could, but the built in TX for NTSC Ch 3 or 4 is very good.
You could do that, then use RG-58 coax & go up to about a half a mile. The signal has more integrity when transmitted on a carrier.
A composite or S-video signal WILL degrade & have losses. The difference in the two examples you have stated all has to do with frequency. 50' or so at AF <20Khz the losses are negligible. AT RF >500Khz which is where Composite video lies at around several Mhz bandwidth, the losses & degradation goes up significantly.
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