Hi,
I've got this 50 ft RG-59 cable I use between the LNB and my Fortec
Classic box (yes, I know I should use RG-6)...
Anyways, it sometimes works to bring in a signal and other times not... when I was watch TV, it would be fine, then intermittent say "bad signal" and back to getting a signal (nice strong 60% quality) again, and back to "bad signal" etc... I made sure my connections on both ends are tight....
The cable is routed under my crawl space... Could the only explanation be that there is a "kink" somewhere along the cable run? I guess the way to detect this is to get out my ohmmeter and measure continuity on the outer metal contact and inner wire on my ends and look for a low ohm value, say 1-2 ohms...
Or does the cable have to be really straight? Who knows how curvy the cable is underneath the crawl space yet...

heheh..
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Fortec 80cm dish, Univ LNB.
Fortec Classic NA
Captiveworks 600S Premium.

C-band 10ft dish, with Echostar 4000 IRD.