Quote:
I've put it near the ceiling on a long line lead to get over the problem, for some reason, extending the aerial wire makes reception worse.


Code:
 

Half wave aerial length (in feet):

    468
---------
wavelength (mhz)

Quarter wave aerial length (in feet):

    236
---------
wavelength (mhz)



See, I did learn something at uni!

Basically there for a given frequency there is an optimum length of aerial. This length can be reduced but only by certain divisors like 1/2 or 1/4. I would imagine the damp string is probably about 80cms long if it's a half-wavelength or possibly 40cms at quarter-wavelength.
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Cheers,

Andy M