Hi SatKartr,
As JohnK has noted, you should be good for several hundred feet of unbalanced cable run with no problems, and there is no need to use balanced XLR runs.
It's very rare that a long run of coaxial cable will pick up RF unless your place is nearby a big commercial transmitter. Even then, in my experience, it's usually unshielded speaker cables that will be susceptible to RF pickup, feeding a signal back into an amplifier or receiver where it's rectified and heard in the background (I speak from personal experience here; when I worked for CBC television, I lived a few blocks from the downtown Toronto transmitter, and had bad RF pickup of the TV audio on my stereo system. I traced it to the speaker cables. When I replaced them with shielded cable, the RF TV audio disappeared.)
Regards,
Alan
