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Author Topic: Stealth Vertical  (Read 330 times)
N4CR
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Posts: 1662




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« on: November 19, 2007, 10:52:02 PM »

I was reading the other day that the purpose of the radial field under my 5BTV was to provide the other half of the antenna, like the phantom image of the antenna was sticking underground.

So I got to thinking. What if I drilled a big deep hole and put the 5BTV in the hole and put the radial field on the ground above it. It would be stealth because only the phantom antenna would be sticking up in the air.

Due to the lousy solar cycle, the bands are dead right now. I hope the sun spot count gets going soon...
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73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
ONAIR
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Posts: 1738




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« Reply #1 on: November 19, 2007, 11:09:36 PM »

  It might work if you want to reach the underground ham community!
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WA2JJH
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Posts: 523


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« Reply #2 on: November 20, 2007, 01:30:05 AM »

If you can elevate the vertical 10-20 feet off the ground or roof, a simple counter poise would be a good compromise.

  You could try a 10-20M Vertical. I use a counterpoise and 4 foot long fiberglass radials. I loosly coiled 14 feet of wire around the fiber glass.

  How about a 10M vertical dipole. Use ultra thin guage wire. Use a tuner for lower bands. It will work great 10-17M. Not great on 80/40m
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WA3SKN
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Posts: 5457




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« Reply #3 on: November 20, 2007, 04:55:46 AM »

You would be using the wrong frequencies for underground transmissions!
If you are serious, it's a bad plan... if you are not serious, it's STILL a bad plan!

-Mike.
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W7AIT
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Posts: 488




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« Reply #4 on: November 20, 2007, 05:39:14 AM »

Hey , the ARRL did that one in the 19XX April Fools edition.  

The really quiet antenna.

The underground 1/2 wave.

The 1/2 wave in a garden hose laying on the ground.

All a joke my friend.

Height above ground and a Counterpoise needed!

(Say try the 1/2 wave Slinky, I hear those work really well)....hehehehehe
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W8RPE
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Posts: 108




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« Reply #5 on: November 20, 2007, 05:42:13 AM »

Try it and let us know how that works for ya...
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KA5N
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Posts: 4380




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« Reply #6 on: November 20, 2007, 06:51:35 AM »

Larson Rapp WIOU examined that.  He read that an antenna above ground also had an image antenna below ground.  Since he couldn't get an antenna high enough he decided to bury the actual antenna and then the image antenna would appear high in the air.  Mr. Rapp's ideas seldom worked out very well.
Allen
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KT8K
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Posts: 1490




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« Reply #7 on: November 20, 2007, 10:41:02 AM »

Ground losses would detune the antenna badly and eat up the energy almost completely ... it might even look like a short to the transmitter.  As the ground has shielding characteristics at HF you could probably do as well encasing your entire antenna in a grounded metal box.  In either case it won't radiate or hear much.  (It would be nice if it did, though ...)
Best rx & 73 de kt8k - Tim
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WA4DOU
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Posts: 436




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« Reply #8 on: November 20, 2007, 01:10:14 PM »

Money spent on an ARRL Antenna Manual would be well spent.
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K4JC
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Posts: 76




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« Reply #9 on: November 20, 2007, 10:55:54 PM »

Gives a whole new meaning to the term, "well-grounded antenna!"
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N4CR
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Posts: 1662




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« Reply #10 on: November 21, 2007, 06:32:17 AM »

"Money spent on an ARRL Antenna Manual would be well spent."

Unfortunately, I dropped the manual in the hole  before I got the antenna down in there. It took me 15 minutes to jam it all the way to the bottom with the 80 meter trap.
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73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
WA4DOU
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Posts: 436




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« Reply #11 on: November 21, 2007, 08:56:31 AM »

I don't doubt it for a moment.
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N4CR
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Posts: 1662




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« Reply #12 on: November 21, 2007, 12:01:09 PM »

I think it might have bent the stinger. Maybe that's why it's not picking up much signal...
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73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
ONAIR
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Posts: 1738




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« Reply #13 on: November 21, 2007, 02:42:29 PM »

   You bent your stinger??  OOUCH!  That musta hurt.
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