Program officials from Ohio's Multi-Agency Radio Communications System – a statewide 800-MHz digital trunked radio system -- sent a weather-proofed radio repeater up to 1,000 feet. At that altitude, the system locked onto a tower about 50 miles away, said Steve Garwood, a MARCS telecommunications system analyst.
http://www.gcn.com/online/vol1_no1/47583-1.html
http://www.gcn.com/online/vol1_no1/47583-1.html