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RFMedic is right, not just the sites needs, but in a heavy RF environment you might see a lot of desense happening, effectively making your repeater deaf. I would if looking also consider the other services on the site and the amount of activity it has.

It all depends on site management and the territory it serves. Here in New York City the install costs at some locations could run you $5000 plus the monthly because you have to factor in the cost of liability insurance as well as the fee for the climbers to mount your antenna and route your feedline. Also, most well organized sites have minimum equipment requirements I.E. You're not going to get away with 2 mobile radios and a cheap duplexer/antenna. You've got to coexist with the other customers at the site so quality equipment is a must. Again it is all location specific...