Join Date: Jul 2009
Location: Eastern Ontario (Ottawa/Kingston)
I do not have any major ATTIC antenna setups in use yet.
Neither at the house in Kingston, nor at the flop house in Ottawa.
But I have been up in the attic in Kingston doing some experiments for FM radio reception - which might give similar indications for VHF TV signals.
Just went up into the Attic with a half decent, portable battery power FM radio with a rod antenna - and moved the radio and antenna around and tried the rod antenna in different places, heights and orientations. Trying to tune in some weaker FM stations, from different places, who's location and approximate distance I know.
Trying to find the "hot spots" in the attic seems to be very important. Just like with other indoor antenna setups.
So what I learned in that particular ATTIC in the Kingston house, was that the best reception of weaker, furthur FM stations happened, generally, with the rod antenna HORIZONTAL / parallel to the floor beams, and elevated about ONE (1) foot above the attic floor beams.
Horizontal seemed to give some directionality and null out some noise and interference from other stations.
Right directly on top of Attic floor beams - no good.
As I went higher than around 1 Ft above the floor beams, getting closer to the peak of the attic, the signal slowly got weaker.
Now it would be natural for someone to just try to lay or mount a YAGI or Dipole right on the floor of the attic - but that does not seem to work so well.
Then, on two sides of the Attic - we have vertical walls of brick.
Placing the antenna, horizontal right near the vertical wall, about ONE (1) foot up from the floor beams, for signals coming from those directions - seemed to work best.
If the signal had to go through a slanted / shingled part of the roof, it worked best again - about ONE (1) foot off the floor beams, but this time in the CENTER of the ATTIC. Not attached near or on the angled roof beams, but instead, centered in the Attic and hanging in open air in the middle of the Attic, about a foot off the floor.
It is interesting that another member noticed the same thing in his ATTIC.
Raising his home made, 3-Element, ch 6 yagi - up a little from the ATTIC floor beams - helped him receive RF CH 6 Digital (Global in Ottawa) alot better.
(seems to have gotten rid of / greatly reduced digital pixelation every 10 seconds when he had it near the attic floor beams - they think this was due to possible impulse noise from the house / and/or wiring near the attic floor beams - and the antenna being placed right on top / very close to it. )
For now, I am just doing some simple experiments with simple rod antenna or dipoles for now in the attics - but the results are very interesting.
Different attics may work differently ... you just have to experiment and try to find the "hot spots" for the signals of interest.
Metal siding on the eaves and gables of the roof are horrible for signals, and you have to try and stay away from those.
Years ago I got scraps lengths of 3/4 or 5/8 plywood and screwed them down on the Attic beams for the length of the ATTIC, in the middle where the peak is and where the roof is tallest. That made moving around up there much easier and safer. (don't want to fall through between the attic beams).
It seems like many people do ATTIC installs - for many good reasons.
So this thread should become interesting.
P.S. I know there are may other examples of ATTIC installs in various threads scattered around in the OTA part of the FORUM. All very interesting setups.