Don't listen to the haters (disclaimer: I work for DirecTV).
Here's the basic overview:
HD over DirecTV requires three main components:
1. A HDTV (duh)
2. An HD receiver
3. An oval, 3-LNB dish
If you already have #3, you can pick up the HD receiver at any DirecTV retailer (Circuit City, Best Buy, etc) and just swap your existing sat box for the HDTV receiver. The cost will be about $299 + tax. Since I already had the oval dish, this was the route I went with my upgrade.
If you don't have the oval dish, you have a couple options:
1. DirecTV will charge $349 + $14.95 delivery/handling to install the receiver and the oval dish. This comes with a 1-year commitment and also requires you to keep the HD package ($10.99/mo) for a year. You also have the option of relocating the existing receiver to another room (for added cost of $4.99/mo for the additional room) for free.
2. DirecTV will charge $49 + $14.95 delivery/handling to upgrade just the dish. Then you can get the receiver at retail and spend the same amount of money as option #1. However, you don't get the relocation so if you want to move the box to another room, use option #1 (relocation costs $97.50). This also comes with a 1-year commitment, but you aren't required to keep the HD package for a year.
3. If you're really technically oriented, pick up an Oval 3-LNB dish and install it yourself. This option is only worth it if you're confident in your dish setup skills and you can get the dish for less than $65 + tax.
Regardless of which of these options you go with, you'll also need to get the NFL Sunday Ticket Superfan upgrade in order to get NFL games in HD. The Superfan upgrade also gets you access to the NFL Red Zone channel (hot plays as they happen, all on 1 screen), the NFL Sunday Ticket Mix channel (up to 8 games on 1 screen), and the NFL Sunday Ticket short cuts--every play from every game back-to-back in 30 minutes or less, available after all the games are done on Sunday (usually around midnight ET).
The Superfan upgrade is $49 if you had the NFL Sunday Ticket in 2004, or $99 otherwise (or 2 payments of $49.50).
As far as quality goes...
Nerevar said:
directv also does downsample their HD service (their whole "every channel is digital-quality" advertising campaign is pure nonsense). Their HD feeds are lower quality than most cable companies. Be forewarned.
I'll call bullshit here. I've had my HD service for a couple weeks and it's awesome. I can barely stand to watch the standard-def stuff.
pj325is said:
Screw directv's hd. Too expensive, too few channels. Dish network just bought the failed Voom service's satellite, so their hd content will improve dramatically soon. I'm not sure what dish charges for HD, but I'd suggest waiting until they have one of those free installation, free equipment deals with hd, which I'm sure they'll be pimping soon.
More uninformed babbling. Voom's service was high definition by spec only--most of it was standard def stuff upsampled with a line doubler. It might look marginally better than standard def, but nowhere near as amazing as true high def. Dish is already offering the voom content, but you have to get a separate dish and it's a separate charge (like $7.99) on top of their regular high def service ($9.99).
DirecTV will be carrying high def local channels for 12 major markets by the end of the year (at least, that's the current plan). Think LA, NYC, Atlanta, Dallas, Boston, and a number of others I can't remember off the top of my head. In addition, DirecTV plans to carry more national HD channels as they become available. Right now it's a matter of getting the satellites launched and the necessary receiver technology deployed. Expect more announcements as plans finalize over the next year or two.
Nathan