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Author Topic: Apex Stealth Antenna  (Read 599 times)
WB0UQD
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Posts: 55




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« on: October 26, 2017, 06:30:13 AM »

I put up antennas at my parents house, which has a HOA like every other house within 50 miles. I thought I might try an APEX antenna. Run a wire antenna along the peak of your roof. You can't see it from the front, and you can't see it from the back. It would be a really good long-wire antenna. Or, you could actually create a dipole if you drilled a small hole in the center. Has anyone else tried this?

73's
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K4FMH
Member

Posts: 425




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« Reply #1 on: October 26, 2017, 06:52:35 AM »

I have used this for five years except that it’s immediately beneath the apex or ridge of the longest run of my roof. It’s an MFJ 80/40M dipole, broadside to Europe. It works fine even in the presence of a foil-backed radiator barrier. It’s about 40 feet above ground.

An additional wire antenna is a sort-of horizontal loop with the wire an inch inside of the shingles. There is a wooden trim on which the shingles sit and the wire is just behind that trim. It comes into my attic at one point (each end of the wire) to a balun and then ladder line to another balun to coax at my remote antenna switch in the attic space above my 2nd floor shack. It is resonant betwee 160 & 80 meters but will the from 160-10M.

Hope this info helps.

73,

Frank
K4FMH

I put up antennas at my parents house, which has a HOA like every other house within 50 miles. I thought I might try an APEX antenna. Run a wire antenna along the peak of your roof. You can't see it from the front, and you can't see it from the back. It would be a really good long-wire antenna. Or, you could actually create a dipole if you drilled a small hole in the center. Has anyone else tried this?

73's
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WB6BYU
Member

Posts: 17038




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« Reply #2 on: October 26, 2017, 08:45:28 AM »

It works best when your roof is wood shingles.  Composite roofing has
higher losses, but still can work. Unglazed tile is particularly bad when
it gets wet.

When I lived in an apartment I stacked some furniture on my balcony
and climbed up on the roof in the middle of the night, strung a long
wire down the peak, and dropped the end over the side down to my
window.  (I don't necessarily recommend that approach, but I was
younger back then...)  it worked quite well, even though I mostly
ran QRP.  In several cases I have Ron a loop of wire around the roof,
either tucked under the corners of the shingles or stapled to the back
of the fascia board under the eaves.  With my current 40m loop the
resonant frequency shifts significantly when I stick some Tupperware
containers under the wire in multiple places to hold it up off the roof.

Another option might be the zinc strips you nail to your roof to (try to)
inhibit moss growth:  the resistance is higher than copper, but I've
often imagined using them as a backup antenna.

I use insulated wire in a color that doesn't show up against the roof.
Teflon insulation is more expensive, but will last longer in the sun.
Magnet wire can also work, but will sometimes glint in the sun.

Do you put up Christmas lights?  That's the perfect time to add a wire
antenna around the edge of the roof, because everybody else is up on
ladders too.

For a dipole or other antenna with a feedpoint on the roof, you can run
the feedline into the attic through a roof vent, or arrange it so it follows
the pattern of the shingles to make it less noticeable.  RG-174 coax can
be used for minimum visibility - losses are higher, but you shouldn't need
too long of a piece to get off the roof and out of sight where you can
switch to a larger cable to run to the shack.

I put up an antenna for a friend of mine while his wife was out:  3 months
later she still hadn't noticed it, and I'm sure none of his neighbors had,
either.

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