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This signal from dish to set top box should be amplified, I doubt your college has an amplifier, and if they do it's not up high enough (although if you're gettting snow rather than macroblocking, it's probably on the analog side of things.) From box to TV, what options are available? S-Vido looks a bit better than Composite and deals with interference better because of the twisted pairs and shielding, and RF coax cable pulls radio interference like it's getting paid to do it, especially if it's near power wires.
The first thing I'd look for is bad cables with ground fault from shield to conductor, and even if you don't have an apparent problem, I'd replace everything with RG6 and durable connectors (when it comes to connectors, it's Neutrik or nothing.) You can even make RCA cables that don't need to be moved much from RG6, soldering the conductor into the pin, then pulling back the shield and crimping it into the grounded strain relief.
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