just to keep people legal, please remember that PMR 446 radios are only legal to use without an OfCom issued licence if their power output is limited to 0.5Watts
a 5Watt radio is a commercial product requiring a licence.
The Motorola claim of 10km on 0.5watts is rather optimistic and would rely on perfect conditions including terain, air temperature and humidity, lack of other RF interference.
2-3km is more realistic using licence free PMR446.
Oh, and you'll probably want to start calling them "drivie talkies".
a 5Watt radio is a commercial product requiring a licence.
The Motorola claim of 10km on 0.5watts is rather optimistic and would rely on perfect conditions including terain, air temperature and humidity, lack of other RF interference.
2-3km is more realistic using licence free PMR446.
Oh, and you'll probably want to start calling them "drivie talkies".