A wheeling buddy of mine turned me on to this from Amazon. Inexpensive (23 bucks!), works out to about 250 feet, handles 15 amps via internal relays so no problem sinking the 800 milliamps that a standard winch relay pack pulls:
http://www.amazon.com/Pilot-Perform...29-Wireless/dp/B000BRJF62/ref=sr_1_1?s=automotive&ie=UTF8&qid=1333130375&sr=1-1
http://www.amazon.com/Pilot-Perform...29-Wireless/dp/B000BRJF62/ref=sr_1_1?s=automotive&ie=UTF8&qid=1333130375&sr=1-1