A ground tuning unit is sometimes useful for vertical antennas.
Especially those over or near salt water.
The first one was when I was trying pedestrian mobile antennas for walking along the beach. It worked but changing ground conditions meant its settings varied when I walked over different patches. I eventually reconfigured it to an L-match antenna coupler that became the basis for the Wadetenna I've used for hundreds of pedestrian mobile contacts.
This is a beefier version that could handle more power. It's a much more recent project. It's just the thing if you want to set up antennas for operating from piers.
PS: I've now written six books on various aspects of amateur radio. Whether you experiment with antennas, enjoy QRP or are starting out in radio there's a book for you. Find out more here.
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