[TVARC] Attic Antenna Advice and Council

[Doug Moe]

I have confined my 20 M antenna to the attic over the garage where there are no ducts. The antenna is slightly longer than the garage attic, so I bent the antenna at right angles at both ends, still within the garage attic area. The antenna runs along the peak of the attic, running east to west and is about 15 feet from the ground. 

I've lived in a Whispering Pine and a Lantana and have worked Europe, Canada, California and the Caribbean, driving the antenna with 100W from my 7300. I ran 50 ft of coax from the center fed  double bazooka to my shack in a room at the other end of the house.This is highly dependent on propagation and amount of QRM and noise and varies day to day. This arrangement is obviously not optimal, but its a good way to get started. 

Doug
KC1JZC

> On Apr 13, 2021, at 1:28 PM, Mark Graybill <saundby at gmail.com> wrote:
> 
> Hi Jeff!
> 
> If you avoid running the antenna on the same line as the ducts, you will avoid interactions. Also, if you cross their path, avoid being close to the ducts--get a diameter or two of separation if you can, and cross as close to right angles as possible.
> 
> You should still get as good of radiation as can be had from an attic antenna if you do that.
> 
> I will be running an attic antenna under similar circumstances. I plan to keep it as high up in the rafters as I can, with the feedpoint at or near the apex.
> 
> Mark, W8BIT
> 
> On Tue, Apr 13, 2021 at 12:22 PM Jeffrey M Taffuri <jtaffuri at gmail.com <mailto:jtaffuri at gmail.com>> wrote:
> Hello All this is Jeff KO4NCC,
> 
> I'm seeking some advice before I make an attic antenna investment.
> 
> I live in The Villages and the model home is a Begonia.  Here's a picture of my concerns:
> 
> <bahbfonhnenmhkpb.png>
> 
> My home faces south. The foil HVAC ducts run the length of the east and west sides of my home.
> 
> The duct work also runs the width of the front, south facing side, of the home.
> 
> The north facing side of the home has no HVAC ducts.
> 
> The logical location for me to place a multi-band VHF / UHF antenna is in the rear or North side of the attic.
> 
> So the antenna has:
> 
> Foil duct work on the east and west sides
> Foil duct work and an aluminum solar tube on the south side.
> Am I just wasting my time and money because the way I see it I'll be lucky if I get north side communication.
> 
> Advice and Counsel please.
> 
> 73
> 
> Jeff KO4NCC
> 
> 
> 
> 
> 
> 
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