[mythtv-users] OT: ATSC "omnidirectional" antenna recommendations
linux at thehobsons.co.uk
Mon Nov 7 21:00:20 UTC 2011
Christopher Meredith wrote:
>All my stations are "red," according to antennaweb,
I've no idea what that means. Does "Red" mean good signal, or poor signal ?
>and are all within an arc of 8 degrees or so.
If they are within 8 then you will almost
certainly be better off with a directional
antenna. Not only do they pick up more signal,
but they reject signals from other directions.
Each antenna should have a specification which
indicates the "beam width" - which is the angle
across which it's gain is no more than 3dB below
the headline figure (3dB = 1/2 the signal). Eg,
if you had an antenna with a beam width of 8
then with careful alignment you would pick up all
your stations, and the worse case would be
getting half-strength from the ones at the edges
(ie +/- 4 off axis). In practice, this is likely
to be a lot better than you'd get with an omni.
Also, I don't know what frequencies you use, but
over here most transmitters operate over a fairly
narrow part of the allocated spectrum. For best
results, it's best to get a "banded" aerial -
which means one tuned to the part of the spectrum
your local transmitter(s) use. A wideband aerial
works over the whole band - but tends to be "jack
of all trades, master of none" and will generally
give inferior performance compared to a banded
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
More information about the mythtv-users