Many thanks to everybody for all the suggestions.
Unfortunately, most of them are what I already known (low antenna on stack,
quads and beverages) and I was hoping for a miracolous idea! ;-)
We used our 90m long short 80/160m Beverage to USA, that we can install
only the two contest days, but signals were too low on forty, because it is
fed with 360m of RG58, which has a 14dB loss on 40m.
No way to have two stacked Yagis or a Quad on 40m and no way to use a
bigger cable, so, last chance will be to add a preamplifier before the 360m
lenght of cable.
Thanks again and 73
Guido, IK2BCP (IR2L on the last two rainy CQWW...)
> On our contest station we have an old but good KLM 3 element linear
> loaded Yagi for 40m, 20m high, which works fine except for the high rain
> drops noise on RX.
>
> Normally we have an average noise floor of S1, but during last CQWW SSB
> and CW contest, we suffered rain during nights and the noise on 40m
> raised even to S7-8 when the rain was strong.
>
> Is there anything I can do, to avoid or greatly attenuate that noise?
>
> There is a coil across the dipole feed (sometimes called Hairpin), to
> match the impedance to 50 ohm, followed by a current balun/choke; what
> if I connect the center of the coil to the boom/ground, could this help?
>
> Thanks and 73
>
> Guido, ik2bcp
>
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