On 11/02/2018 20:59, Don Pearce wrote:
On Sun, 11 Feb 2018 20:18:56 +0000, Andrew
wrote:

How do these work if only a 6 inch stub sticks out of the roof ?

To get a decent FM signal indoors I need a dipole of some sort
that is about 59 inches long, plus reflector and director.

I ask this because I am getting interference on 88.50 Mhz
from Rowridge, but not all the time. Earlier today it
was bad, but the other BBC FM stations were not affected.

When I drove into town, FM R2 on my car radio was fine,
but I don't know what transmitter it is picking up. No
interference at all. Strange.

I am midway between IOW and Wrotham.

Poorly is how they perform. Much better to have a telescopic antenna
that rises to about a quarter wave (75 cm). If you live in a poor
signal area with interfering transmitters coming in, a directional
antenna is the only answer, and you can't have that on a car.

How about DAB? That works 100% better than FM in a car.

d

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DAB is rubbish where I live, and I only want to find out why
88.50 (R2) from the IOW is regularly plagued with much more
hissing than usual, plus a buzzing and faint crackling too.
(But R1,3 and 4 were not afflicted the same way). It's
indoors FM reception that am interested in. I have a 3-element
fm aerial in the loft pointing at the IOW.

Awful yesterday, but today it is fine. It was only when I
went out at 2PM to check out Currys instant sale that I
noticed that my car radio picked up R2 FM without any
interference at all.