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Author Topic: hi-rise window antenna for HF  (Read 5567 times)
AE5TC
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Posts: 3




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« on: July 13, 2011, 01:03:45 PM »

Can anyone suggest a way to utilize my 8th floor office window (aluminum framed 5'x6') to project RF out the window instead of into my skull? I'm thinking it would about be impossible to have any sort of antenna in this enviroment with the antenna on the inside of the window. Obviously I can't open the window or else I would just drop a long wire down to the parking garage...  Sad
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N3LCW
Member

Posts: 152




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« Reply #1 on: July 14, 2011, 05:50:34 PM »

Depends on the HF frequency range.   First, take a look at this:

http://www.aa5tb.com/dl2hrg3.jpg

...and if this interests you follow through with:

http://www.aa5tb.com/loop.html

I use these small magnetic HF loops from hotel room windows and they are very effective.  I've worked to 30M with a loop just a bit bigger than the one in the photo.  You can operate broadside to the loop and be in its null zone.

One final note, you can add about 2db in gain to this loop if make it two turn:

http://www.qsl.net/hb9mtn/hb9mtn_magnet_80.html

Aside from that not sure what else you can do.

Andy
N3LCW
« Last Edit: July 14, 2011, 06:02:08 PM by N3LCW » Logged
K5AF
Member

Posts: 18




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« Reply #2 on: July 31, 2011, 12:33:05 AM »

Copper foil tape works great on windows and can be fashioned into mag loops as well as dipoles on a clean glass surface.  GL
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KQ6Q
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Posts: 991




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« Reply #3 on: August 02, 2011, 11:24:41 AM »

If you have the budget, you could try something like this:
http://www.mfjenterprises.com/Product.php?productid=MFJ-1786
Not exactly unobtrusive, but then an HF rig won't be very stealthy either -
you won't be able to run QRP with this kind of antenna, but you will make contacts.
Be careful of the RF energy exposure ...
you might be safer to make a loop dipole for 6 meters our of copper tape, and use 50.125 SSB from something like an Ft-817 or a small 6m rig - http://www.mfjenterprises.com/Product.php?productid=MFJ-9406X -
with your 8th floor height, and listening with squelch, you just might catch some fun openings....
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KI4YIK
Member

Posts: 23




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« Reply #4 on: August 15, 2011, 02:46:07 PM »

Copper foil tape works great on windows and can be fashioned into mag loops as well as dipoles on a clean glass surface.  GL

Do you have instructions for this?
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