Saturday, February 23, 2019

The benefits of vertical dipoles for HF

We normally think of HF dipoles as being a  horizontal wire strung between two trees. Or, if only a single tall mast is available, an inverted vee with the feed point at the top.  This arrangement provides a horizontally polarised signal. If its height is sufficient there will also be directivity broadside to the wire which may or may not be what you want.

However, especially on the higher HF bands, a vertical dipole is worth considering.  There are several benefits. You get omnidirectional 360 degree coverage.  Their small footprint makes them suitable for narrow courtyards. And, especially if operated by salt water or over a conductive ground you get low angle radiation good for DX. 

The main thing you need apart from the wire and feedline is some sort of high support to hang it from.  This could either be a high tree branch or a telescopic fishing pole of suitable height.

Read some experiences people have had with HF vertical dipoles.

10 through 20 vertical dipole by KL7JR
Restricted space antennas - vertical dipoles by W5ALT
My experiment in building a vertical dipole antenna - instructable by KF5YKO
A short vertical dipole - space-saving design by ON4BAI
Testing a 20m vertical dipole by K1HMS
Demonstrating a vertical dipole on 14 MHz - one of my videos

With very low construction costs you will lose nothing by building a vertical dipole. And with simple adjustment and thousands of satisfied users you have a high chance of success.

PS: Into low power amateur radio? Covering equipment, antennas, operating and strategy, Minimum QRP is the book for you. Available in both ebook and paperback (some countries).

No comments:

Post a Comment

Upgraded website

Enjoy reading about diverse facets of amateur radio? Like building projects? Sometimes find my videos hard to find? If any of these applies ...