Need antenna recommendation - mars Forum at eHam.net

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eHam.net Forum : mars : Need antenna recommendation

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Need antenna recommendation	Reply
by KD8DBJ on October 19, 2009	Mail this to a friend!
I'm starting up a MARS Military Station at my Army Reserve unit in Ohio. I could use some suggestions for a multiband HF antenna. Our requirements would be: - transportable (need to take it on annual training or deployments) - easy to erect (may need to put it up and take it down monthly) - frequency-agile (need to be able to hit MARS, Winlink, and military frequencies) - simple to use (most operators won't have an FCC license) The one I normally see over National Guard facilities seems to be the Barker & Williamson folded terminated dipole, but I don't know how it will hold up to constant set up / tear down. Thanks, WO1 Joseph Hayes, AAR5AJ

RE: Need antenna recommendation	Reply
by K3WVU on October 19, 2009	Mail this to a friend!
The B&W folded dipole is probably the best one, because it is frequency agile. Set it up as a N.V.I.S. antenna (google NVIS). Buxcomm also has several models of the folded dipole at lower prices. Dwight AAR3DK

RE: Need antenna recommendation	Reply
by AC8AP on October 31, 2009	Mail this to a friend!
The NVIS (Near Vertical Incident Scattering) antenna just may fill your needs. Here is a link: http://home.centurytel.net/w9wis/NVIS.html that I used to build the homebrew version shown on the next few pages on his link. I made a few modifications to add strength for repeat set up and tear downs. I have loaded it on 160-10 meters and it seemed fairly broadband, better than I expected anyway. I have good communications within the state and out to about 650 miles. I have worked some DX too, but not it's design intent. We used it at Field Day this past year too. One person can set it up in about 20-30 minutes, but it is better to have two people and set up is much faster. I have worked QRP up to 1000 watts with it. Alan, AC8AP

RE: Need antenna recommendation	Reply
by N9AOP on November 3, 2009	Mail this to a friend!
Joe, The advice you got so far is good. If you use the B&W folded dipole, in its factory configuration it is a real pain to set up and take down because of the stiff and kinky wire that they use. I re-worked one using 14ga flexible coated wire from the wireman. Now it is very easy to deploy and fold up without getting all kinked up. This is an excellent NVIS and ALE antenna when mounted at 15 to 25 feet. On the lower bands, the efficiency is low but this is common in any terminated antenna that exhibits low swr across a large segment of frequency. The military just shoves more in to get out what they need. Art, AAM5RD

RE: Need antenna recommendation	Reply
by N3JBH on November 13, 2009	Mail this to a friend!
Email me at n3jbh@yahoo.com i just might have a answer for you

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