In article , The Artist
writes
"tony sayer" emitted :

I want to set up a wireless home audio system something along the
lines of...

Main system (turntable/cd/tuner/digital) has fm transmitter that
radio's scattered around house can tune into - the idea being that
these radio's could also tune into regular radio. Am I completely
bonkers?

What you're suggesting is illegal. And given the densely packed FM band
unlikely to work without interference.

Yes, but I doubt that this would be a problem over such a small area
Dave. Besides do we know where the OP lives perhaps right out in the
country. Still if the regulator's can't control all the pirates in
London do you think that they'll bother about a few milliwatts, if
that?

Pirates often use microwave beaming or door controlled power cut-outs
to prevent the DTI tracing a signal from transmitter to "studio".
Thus, they are prevented from confiscating the bulk of the equipment
or issuing arrests. So whilst the DTI are busy detecting and pulling
down rigs all over town, the pirates are erecting new ones at about
the same pace, paid for by DJ "subs" and/or advertising. In fact, most
of these pirate stations keep stocks of transmitters for this purpose.
Whilst the DTI are involved in this never ending goose chase, there's
no way they would be remotely interested in triangulating a signal of
the milliwatt range. OTOH, the neighbours may not be pleased.

Why ever not?, surely you won't be transmitting over anything local so
what's the problem?.

Perhaps the neighbours might like "really real local radio"!....

--
Tony Sayer