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Questions tagged [counterpoise]

Elevated ground plane

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1 answer
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Resonant 80m End Fed Halfwave Antenna With Counterpoise - Questions

Originally, I built an 80m EFHW, 130.5 feet long cut for approximately 3.58Mhz. I attached a 49:1 UnUn at the feed point 13 feet above the ground with coax back to the shack. I did not use a ...
Ron K5TDF's user avatar
5 votes
3 answers
1k views

does the shape of an antenna ground plane matter?

I would like to test a tranceiver setup I created before I mount it in my car. In my backyard, there's a length strip of metal; 10m in length, 10cm wide. Now I wonder if I can use that as a ground ...
Folkert van Heusden's user avatar
2 votes
2 answers
2k views

End fed long wire antenna causing issues

I use a hex beam to operate from 20 meters to 6 meters with amazing results. I wish to operate 40 meters and 80 meters also, and can only really install an end fed long wire due to my installation ...
Engineer999's user avatar
1 vote
4 answers
916 views

Why are many ground radials preferable to a single ground stake buried 1m deep?

Surely a 1m copper stake provides better ground connectivity for a vertical dipole?
Adam Palmer's user avatar
4 votes
0 answers
873 views

4NEC2 radials & grounds

Teaching myself 4NEC2 and have most of it under control, which is good. Regarding radials & grounds, i've been learning the "rules" NEC(2) has, summarised below. 4.1. Free space. In the ...
t252's user avatar
  • 697
2 votes
1 answer
657 views

How Do Ground-Mounted Verticals Compare to Elevated Verticals? [duplicate]

Their performance differences may be less than sometimes expected.
Richard Fry's user avatar
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1 vote
1 answer
1k views

Vertical Hustler - do I need any radials?

I'm planning on installing a Hustler 4-BTV vertical by the house. There's already a 12 ft. steel pole mounted in cement, so I'm going to mount it on that pole about 10 feet up (sort of small mini ...
user16431's user avatar
1 vote
2 answers
262 views

Vertical antenna

I'm installing a vertical antenna in back yard. About 20 feet in height and using 1 counterpoise wire 16 feet for 20 meters. Does installing two or more counterpoise wires help?
Jim's user avatar
  • 11
2 votes
2 answers
211 views

Does RF go through thin corrosion better than DC?

I might have a bit of a problem with my groundplane, but I am unsure. I am using a ground screen instead of radials. The problem is the ground screen is made of galvanized metal, but I can see that a ...
Synaps3's user avatar
  • 425
5 votes
1 answer
394 views

Counterpoise wire voltages?

One practice which seems common when operating temporary or portable QRP, SOTA, etc., is to throw a counterpoise wire out on the park lawn or shrubbery, mountaintop or hillside or parking lot ground, ...
hotpaw2's user avatar
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1 vote
2 answers
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Counterpoise/ground/radial options for an Inverted L

I have two 10-meter masts to support a 40-meter inverted L. I have a decent enough sized yard that I have a few options for counterpoise/ground/radial. I could run 1/4 wave radials in several ...
K8KV's user avatar
  • 377
6 votes
7 answers
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Does a 1/2 wavelength end-fed antenna need a good RF ground?

I was searching for DIY end-fed antenna. Some of the articles I found say that for a 1/2 wavelength end-fed I need a "small to no counterpoise" (with a lambda*0.05 m counterpoise), but some other ...
Hose Dias's user avatar
  • 195
3 votes
3 answers
7k views

How thick should counterpoise wires be?

I would like to use a shortened whip antenna with a coil in it's base, e.g. OPEK HVT-400B. My transceiver maximum power is 100 W (and antenna's - 120 W). To make the antenna work I need counterpoise ...
Aleksander Alekseev - R2AUK's user avatar
3 votes
2 answers
3k views

How low can a vertical dipole be mounted?

An answer to this question suggests that raising a vertical dipole sufficiently can create the effect of a phased array. How about the opposite. How low can a vertical dipole be mounted? Can a ...
hotpaw2's user avatar
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4 votes
1 answer
913 views

How Does the Performance of Elevated Radials Differ from That of Buried Radials?

NEC4.2 provides some information about this topic that may be of interest to some readers.
Richard Fry's user avatar
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9 votes
7 answers
17k views

When and why does the size of a ground plane or radials matter?

Consider these three cases: My understanding is that when building or installing an antenna designed to operate over a ground plane (e.g. a quarter-wave vertical), the size of the ground plane does ...
Kevin Reid AG6YO's user avatar
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3 votes
1 answer
2k views

Counterpoise from artificial ground vs base of antenna

I have an MFJ-934 tuner/artificial ground for my MFJ-1699 multi-band vertical (stuck on a balcony, so limited HF antenna options), and I'm wondering if there's any downside to the counterpoise ...
David KF4MDV's user avatar
2 votes
2 answers
422 views

Air conditioner duct as counterpoise?

Many suggestions on the Internet for a "starter" HF long wire, suggest running a wire in the attic. My (South Australian) roof has a 30 degree pitch, and what little space remains contains air ...
Alan Campbell's user avatar