"Glenn McAllister" wrote in message
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The ones in the box switch one of the antennas at a time to the RDF, and
the ones at the base of the antennas groung the out-of-use antennas.

Glenn ZL2TLD

The standard advise from K0OV is to NOT ground the unused antennas, but to
leave them open which is in a non resonant state. This is so they have
minimal effect on the active antenna and thus do not act like a parasitic
element. I'm not sure why, but he recommends having NO amplitude (pattern)
effects in your system.

73, Steve, K9DCI.