[Elecraft] W2 control wire length?

[K 5 R H D Randy Diddel]

Hi,

I have a W2 with an HF coupler and I am entertaining the idea of putting it
out in a waterproof container just before the feed-point of my antenna
(non-resonant vertical). The run is about 75’. Does anyone know if there is
a limit on the cable length? If so, what is it?

Thanks and 73.