The only PMR radios which will stand a chance of working up at Forrest would be one of the accidentally (illegal) modified Intek MT-5050's or similar, as they are higher wattage (4W versus .5W as standard!). PMR's aren't the best in woodland, for reliable comms you would need VHF as has been said, but this is also a pain in the ar$e if you want to press the transmit button legally. . .