I have a boathouse 500 ft. from my controller. There is a low voltage conduit that runs to the boat house, but I would have to be destructive to fish another set of wires to the relay that starts my pump. I have the Rain Bird Esp controller at the house and want advice about using it with a remote transmitter to switch the 24 volt relay to turn on the 220 volt pump for each cycle. Who makes the BEST, Least maintaince, reliable remote transmitter at a reasonable cost that would do this job? ANY ADVICE is greatly appreciated.