Antenna Grounds

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What does the ground on or under an antenna do?

1.) Provides something for the antenna to push against, in other words provides the other terminal for the feedline of a Marconi-style or single wire fed antenna.

2.) Provides an alternative path for currents that would normally be induced in lossy soil or objects under the antenna

3.) Provides a low loss return path for displacement currents caused by the antenna's electric field