I use Icom 144 Mhz unit (2 metre ham radio band). They have plenty of power - up to 50 watts, but you need a sound aerial correctly located to take full advantage. A quarter wave seems to work well, a 5/8 wave is better, as long as it's discreet. A good antenna mounting on a large flat area (roof) with a good earth is essential. Always mount all this equipment discreetly. Range, don't know exactly but we had up to 10 - 15 miles or so. The correct mounting of the antenna is the critical part. You can buy this equipment from ham radio shops- it's not cheap but it's well made. Try Wimo in Germany.
Andrew.
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