Originally Posted by naughtybutnice
Do I need an HD antenna of some sort to receive local channels in HD?
Antennas for receiving HDTV are the same kinds of antennas that people have been using for TV all along. If it says "HD" on the box, it's purely for marketing.
Are any other channels (otehr than local) available in HD over the air?
If you mean stuff like CNN, ESPN etc., no. What you can get over the air in HD is ABC, NBC, CBS, FOX, PBS, CW, MyNetworkTV (maybe not all of these depending on your location and/or your antenna), plus maybe some local independent stations.
I assume that the antenna is not the indoor type available at the local Walmart, etc. If not, then what type of antenna should I be looking to fit - and will this be indoor or outdoor?
Will it need to be mounted high up on, say, a chimney etc?
What kind of antenna you need depends on whether your channels are UHF or VHF or (usually) both, how far you are from the transmitters, whether there are any obstacles like hills or mountains in the way, etc. If you're within 15 miles or so, a small indoor antenna will often work, for UHF at least. VHF can be more difficult.
Go to http://www.tvfool.com/
and enter your exact location and post the results here (they won't reveal the exact location) and someone will probably give you more specific advice.
I don't know enough about HD radio to address your questions about that.