I've always wondered why the NYSP doesn't use repeaters since they seem to have coverage problems.
Swapping out a base station for a repeater, with all else being equal, doesn't increase coverage by itself.
The inbound signal from units in the field still needs to make it to the receiver, regardless of whether that signal is repeated or is only monitored at the console. Using a repeater in place of a base station where inbound coverage is lacking will only result in a crappy signal getting rebroadcast.
In either case, assuming that the outbound signal has greater range than the inbound signal for a given area, the best solution is to install voted receivers in areas of poor inbound coverage. That can be done regardless of whether or not the signal is repeated, as either way the consoles will "hear" the strongest voted signal from a pool of two or more receivers.