Here's another great antenna idea from Australian radio amateur Peter Parker (VK3YE).
In this video, Peter assembles a simple top loaded HF vertical antenna which covers several amateur radio bands.
Thanks to some good grounding over a patch of salt water, this antenna performs very well.
Antenna materials for this project are simple and easy to find.
If you can't see the video, please insert this title URL into your browser search box:
https://www.youtube.com/watch?v=P7lxt8EatDw
Here are some comments from Peter (VK3YE):
Don't have much height but have something metal underneath? If so a top loaded vertical is a great antenna to try. Just 10 metres wide and 5 metres tall it will even load up on 3.5 MHz. Especially if you're over salt water, you're unlikely to get anything better for its size.
The key items needed include wire, two poles, a simple antenna coupler (an L-match is fine), something to clip onto the counterpoise railing and a ground tuning unit. I'll probably describe a more refined version later but it comprises a variable capacitor in series with an inductor. It's also desirable to have an RF current indicator.
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