It depends a lot on what you are putting at the far end of the cable.
One little new-technology, low-power LNB might work quite far out.
A motor, couple of switches, and several LNBs might not make 200 feet.
The bandstacked LNB are designed particularly to deal with the large voltage drop of long cables, and still work.
They don't use the 12/18 volt difference to select V/H polarity, so as long as enough voltage is delivered to the end of the line, the LNB performs.
Didn't we just have a thread yesterday where the solution to failed motor was excessive switches and in-line amplifiers?
It's a shame we don't routinely test our wiring and measure voltage at the LNB under operating conditions.
That way if we find 10 volts and 15 instead of 12 & 18, we'll know in advance how much operating margin we have.
Perhaps it would then become common knowledge that LNB-X is a power hog, but LNB-Y is a real low-power wonder and much better for long cable runs.
Now, we regularly comment on which ones are physically heavy and which are light.
Same goes for the common diseqc , 22khz, and multi-switches we use.
Publish and pay attention to power consumption.
Regardless of voltage drop in long cable runs, there is another problem lurking in the corner.
Most PCI cards just won't supply the kind of current to the LNB cable that set-top-boxes will.
So, doing a simple power analysis for them is even more critical.