A transistor radio puts out such a minute amount of RF (at 455 KHz and/or 10.7 MHz, the IF freqs of the radio) that most insturments designed to pick up RF can't detect this stuff from more than a few feet away.

The problem is caused by local oscillator radiation interfering with the ILS receiver. Tune a FM broadcast band receiver to the right frequency and you get local oscillator radiation at (f + 10.7 MHz), right in the middle of the aviation band. //---------------------------------------------------------------------------- // John A. Limpert // johnl@radix.net