Lostgallifreyan wrote in
:

This is nice because it beats the issue with two ways to be selective.
Even so, I have to have one last shot at the broadband notion: could a
6dB boost with one of those MAR6-based antenna amps be worth a shot?
Driving a local diple, taped to a doorframe perhaps, in the centre of
the flat? Given the tiny size of those IC's I doubt the amount of power
getting out of the flat will be a nuisance, especially given its
reluctance to allow RF in (except through the celing, and a dipole taped
vertically to a doorframe isn't going to send a lot upwards either.. To
some extent the business may be eased by the fact that the two
frequencies I'm most keen to get, 91.5MHz and 93.7MHz, aren't far apart.
If there is ANY chance this can be solved with no modification or
encumbrance to the tiny radio I intend to carry from room to room,
that's the way I want to do it.


As a possible answer to my own question I can add this:

After looking on eBay to see if cheap widgets might be found and suitably
coerced, I learned that there are lots of cheal FM transmitters for immediate
local use, in nanowatt range for power. Following that up, I discover that in
the UK it is legal, as of around 2007, to set up such transmissions for car
and home use, and this is a starting point.

I know that if a dipole is cut from thicker stock, it is more broadband, has
less Q (and must be cut a tad shorter than theory states for an ideal wire).
I don't know a lot more than that, especially what results if two frequecies
fairly close to each other like 91.5MHz and 93.7MHz are.

Apart from objecting to UK govt policy on priciple (no bad thing right now,
as it happens..), is there any objection, thought, or advice anyone wants to
add to this? If it is an objection, I want a clear reasoning of why.

As far as I can tell so far, my original notion looks viable still, so long
as I can limit feedback and any emissions not directly matching signals
picked up in the first place, and so long as the total power is well within
the new legal requirements, which it will be, I want to use as little as
possible on the basis of feedback avoidance.

(In other news: that specific source of pulsed noise vanished, someone turned
it off nearly 48 hours ago, and it has not returned yet. The current problem
is purely one of attenuation, too little internal signal to allow clean
stereo sound on FM, and it looks like as little as 12dB would easily fix this
with no change to the way I use a portable radio.)