[Arran]

I performed a little research on the old FM band on the internet, I also ran across an article in an old 1945 copy of radio craft. The 42 to 50 megacycle band was switched from FM broadcasting to amateur use in November of 1945 I believe, then later on it was assigned to "Citizen's Band" use. In theory there could be CB activity in that band but I don't know whether you could listen in on an early FM set as the modulation is different, one of our experts would know. I was way off regarding the TV sound, I forgot that the Soviet set that could pick it up was in the 60-74 MC range, the old FM standard for Eastern Europe.
Here's my next point, given the interest in home broadcasting with limited range transmitters, it would make sense to construct such a unit to make use of an otherwise useless band. Given the old radio hobby I'm going to make a guess that someone has already done this.
Best Regards
Arran