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Yep. Just for reference, the rough voltage drop for RG-6 is 0.04VDC per foot of cable. 500 feet of cable would mean a 20VDC drop, which is more than the receivers put out (13VDC and 18VDC).200' for the Slimeline is max. After that it runs into a voltage problem and can't switch properly. 500' I don't think you could even do it with RG11 and amps.
If you do a tower you will probably have to hire a retail installer to do the install, as most techs wont touch it.