I know this isn't the question you asked. (fully realize that) but the
question I'd ask myself is:
How well can I HEAR with ANY type of antenna in an attic?
Back in College I put a multiband fan dipole in an attic of a 16 unit apt
bldg and it "got out" just fine but I couldn't hear on most
bands worth a darn due to a lot of RFI etc.(s5-7 solid noise level, most of
the time) That was just at the dawn of now commonplace switching power
supplies.
Your houses contents will be your enemy. I know I can't hear a thing with a
rig inside my own house (KX2 or KX3 with indoor antennas, just playing
around) so most of my antennas are 150-200' away from my own house and
500-800' away from my neighbours. It's very quiet here, most of the time, in
most directions. I worked 3Y0J today on 15m and they were in the
dust---mere whispers. Saw gobs of complaints that few were working them in
NA on 15m, yet I did with very small antennas, located way out in a field.
So, a fan dipole will likely work just as well as any upside-down Hex (what
a great idea) as it's not likely to be very quiet, regardless of where it's
aimed, until you work on your (and your neighbours) trashy switching power
supplies, etc.
GL !
Mike VE9AA
Mike, Coreen & Corey
Keswick Ridge, NB
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