--- getagripatlanta <[EMAIL PROTECTED]> wrote:
>
> > I have a USB antenna that I can record HDTV off
> the air
>
> How is the quality of the HD from the airwaves? Is
> it as good as
> cabled? Any dropouts? I suppose that's just for
> stations like ABC,FOX,
> etc. that are stations broadcasting if HD along with
> their SD signals.
> Are there just a few signals or hundreds?
It depends on where you live. All terrestrial TV
broadcast stations in the USA *should be* broadcasting
in digital by now. They must be by February 2009, when
analog NTSC is gone.
With the bandwidth they have, a station can broadcast
a couple of 1080i signals or five or six 480i signals.
When the local PBS station is broadcasting a 1080i
show, they shut off 3 or 4 of their other channels.
The digital signals are line of sight, they don't
bounce off clouds and mountains like the analog
signals, so you need to put the antenna up as high as
you possibly can.
You DO NOT need a "digital" antenna. ATSC is using the
UHF spectrum so any decent omni-directional UHF
antenna will work fine.
ATSC is more sensitive to things getting in the way of
the signal than digital satellite TV. You either get
the signal or you don't, sometimes it'll break up all
blocky for a short bit before cutting out completely.
Digital satellite will try to display whatever it's
receiving until signal loss gets too bad. Really heavy
rain or snow can also interfere with ATSC broadcasts,
just as it can with UHF analog since they're using the
same frequency ranges.
I have a 37" Magnavox LCD and use a TERK brand VHF/UHF
loop antenna clipped onto the DirecTV dish. It has a
built in diplexer, and with a diplexer indoors it
sends everything over one coaxial cable. That antenna
works quite well for digital even though I'm on the
fringe with it for analog TV. (TERK makes a larger
version of this antenna.) I need to get it up higher
because I'm not getting all the digital channels and
for some reason when semi-trucks drive by the digital
channels for 2 and 6 tend to cut out, even though the
antenna is higher than the tops of the trucks.
If you're wondering what will become of the VHF
frequency range, one interested buyer is Google, but
they're up against some other big money players when
the government auctions it off.
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