This is moving off the thread a bit, but for the information of anyone concerned, I have direct experience of a scanner seriously interfering with a marine band VHF transceiver. (c.156Mhz - Air Band 108 - 139+ Mhz) The scanner was 30-40 feet away from the other sets aerial at the time.
I have therefore resisted all temptation in the last ten years to attempt to use the scanner when flying as SLF.
I am not fully up to speed on the technicalities, but I believe it is due to the scanner 'generating' the frequencies in its PLL (phase locked loop) circuitry.
Maybe someone out there with the 'nous' could comment.