I am occasionally using an extremely simple shortwave portable setup consisting of a battery, the transceiver, a short coax feedline and a vertical half-wavelength vertical antenna with a transforming ladder-type feedline.
| | | λ/2 | H H ladder H ------ ----- H |Batt|--|TRX|XooooooooooX ------ ----- X .. Connector H .. two-wire ladder o .. coax
My goals are both to optimize the system's efficiency and to minimize uncontrolled radiation from the feedline and transceiver itself.
I would normally try to ground both the transceiver and the connection point between my arbitrary-length coax feedline and the antenna's connector. However, this resulted in bad performance, and indeed, the antenna's description encourages keeping the feedline mechanically far from the ground and "free-floating".
Should a setup like this be grounded using just ground spikes, should I rather provide a defined ground using wire or would it be best to not care and rely on the fact that the antenna is resonant?