Do I need some special antenna to catch over the air HD signal?
CTV (in canada) is brodcasting some shows in HD.
How do I get it?

No. Most standard TV antenna will be able to "catch OTA HD" as long as you are in range.

Might I suggest the Silver Sensor. That's got good reviews if you are in range.

I picked up an indoor amplified radio shack antenna for about $40 and pretty much pick up everything in the area with no problem. I tried bunny ears but the signal is just too weak.

I use a UHF double-bowtie antenna. Works like a charm.

My silver sensor works great except it doesn not pick up NBC HD.. unless I move it around a little and have it hanging in the middle of the room!

NBC here is on VHF Or UHF, the opposite to all the other channels

thanks for the info ..

lets say i get an antenna ... plug it in the tv like I would a regular antenna .. aim the thing .. scan for channels..

how does the tv switch to the HD stream. i mean, like you see shows that say ..broadcasted in HD as well.

do i do something to get that stream instead of the regular tv?

The standard def channel would show as "5" (as example, I don't know what actual channels you have) and the HD channel would show as "5-1".

Chew, out of curiousity, how close to GB are you, do you get your locals OTA, and how good of reception?

I get all my local HDs OTA and I'm about 20 minutes away. I get great reception on all of the major channels (NBC, ABC, CBS, Fox). We're talking 85-95% signal strength. UPN is another issue, the signal strength waivers greatly and causes the picture to break-up quite a bit. I have to record Veronica Mars in SD on the satellite.

I have a Radio Shack roof top antenna that's about 6ft tall. I guess it's a lot bigger than I really need for being that close.