Scooby074
Super Member
Our Panasonic KX-TG1034 is about four and a half years old and has been good so far, but we're never as far from the base as the OP. I guess my wife has gone in the house next door and it still worked OK. But it's only 1.92 to 1.93 GHz.
I get around 200 ft from the base regularly. I cant say for sure if it would reach the OP's 300. Alot of things can affect the range like base location and topography of the lot.
My advise is to buy and try.