这对我们无线电爱好者和BCL接收FM广播和TV伴音是一个挑战，一般情况下大气波导对UHF段的信号好于VHF段的信号，所以这对偏爱玩对讲机的无线电爱好者也是一个挑战。 2、对流层散射传播 在对流层没有形成大气波导的传播条件下，在距FM和TV电台150-400公里的范围 ...

If your TV was VHF it couldn’t receive the new channels, and this box was the answer to connecting your UHF antenna to that old TV. It’s a relatively small plastic case about the size of a ...