No local HD in southern Utah

That answer is only partially correct. It is true that DirecTV "shut off" local HD stations VIA SATELLITE, because of marginal reception at the edges of the satellite spotbeam transponder. But they did nothing that should affect your ability to receive those stations with the AM21 and a suitable off-air antenna. Perhaps there's a problem with your off-air antenna? Or the AM21 Off-Air Tuner Accessory?

Also, replacements for defective equipment does NOT change your contract commitment period.  Only equipment upgrades or additional equipment does that. 

My non Directv HD receivers are functioning just fine.  I have consulted with other Directv customers in this area and they are experiencing the same problem  , Directv has is actively blocking reception of local HD broadcast through both satellite and over the air broadcasts in their boxes.

Doesn't make any sense. There's simply no way for them to "block" the off-air reception using the AM21 Off-Air Tuner, or the H20/HR20's built-in off-air tuners.  

Are the Cedar City  translator (or low power stations) analog or digital?

chittyb - not so. DirecTV does not and can't block reception of your over the air signals, unless the channels have been removed from the guide for some reason. It's far more likely that for example the local translators changed their actual frequency and did not tell Tribune (who produce the guide).

Do the channels appear in your over the air channel guide? Which specific channels are you talking about?

Every station off Mt Kanarra is digital with 2 of them also analog.  the AM-21 was receiving the primary .1 HD untill Directv blocked them and activated the non HD .2 channels which they did not recieve earlier. The HR-20 also could not bring in the local HD that it used to.  I have also consulted with two small satellite installers in the area and they have confirmed that it is Directv corporate level  managers who aer causing this. 

 The AM-21 receiver is not an open receiver that puts every thing it receivs on the screen.

I'm no over the air expert but it appears to me there is some technical difficulty here that you are converting to a conspiracy theory.  I would guess that Directv's corporate level is not even aware that you are having OA issues.  I would also assume that it's a Federal crime to block OA signals.  That being said, Directv did decide a while back to limit the number of OA sub channels they would list for the HD DVR guide due to limits on Guide space in the sat feed.  We see posts from folks complaining that Directv didn't add the .6 sub channel, so you can see how far this can go.

You might want to discuss specifics with these folks who are here to help you and maybe they can help get your system working to the degree you expect.

dcd is spot on.  It's hardly a "conspiracy".  Much more likely a technical issue with Tribune's Guide Data.  

I checked the OTA reception info at tvfool, and then the Tribune guide data t zap2it.com., and also antennaweb, for that zip code.  The results are just a mess.  I can't understand the Tribune data at all, it's not clear to me which channels are coming from where, and I am not surprised that the DirecTv guide is wrong.  And they don't seem to map onto the tvfool listings at all. This is nothing to do with DirecTV "corporate managers".  Whoever operates the various translators needs to give Tribune an exact statement on which channels are coming from which frequencies, and what are their "virtual" channels as well as the real ones.

FYI this is not an unusual situation where there are repeaters.  Often the station managers do not supply Tribune with the correct information., because they do not understand that if there is incorrect real-to-virtual channel mapping, the DirecTV boxes won't work correctly.

Chittyb, going back to my question. Exactly which channels are listed in your guide, and which ones are either incorrectly described or give you 771 messages??

To answer texasbrit, in the guide (off Mt Kanarra) 2.1,  2.2 ,4.1 ,4.2, 4.3, 5.1, 5.2, 5.3, 7.1, 7.3, 11.1, 11.2, 11.3, 11.4, 13.1, 13.2, 14.1, 30.1, 30.2.

Only the .1 channels made it onto the screen via Directv boxes untill a few weeks ago the .1 HD channelswereblocked byDirectv. Then the .2 channels were unlocked and made it onto the screen. Directvs customer service people were all quite polite as were the technical support people.    BUT they could not resolve the problem and wanted to send a technician.  It was a tech. that first informed me that I am not alone in this problem that ALL local HD in this market south of Nephi Ut. was being blocked . As to the Tibune , they supply the same info to another satellite company whose receivers put all the local markets HD and SD channels to the screen.     

As I was on the phone with Directv a short while ago they were wanting to buy back my AM-21 and give me a substantial discount on my subscription, while suggesting that the HD to southern Utah will be restored.  To no avail  informed them that I am no longer a subscriber .                                                                                                       

Sorry, but DirecTv isn't blocking ANY of the OTA channels. The tech, and maybe others, and maybe you, are confusing the DirecTV satellite-delivered HD channels with the ones coming OTA. DirecTV isn't delivering the local channels in HD THROUGH THE SATELLITE because the HD spot beam does not completely cover your area, this issue has been widely posted and discussed. But this does NOT affect any of the OTA channels.  There are only two ways in which you can fail to receive an OTA channel. Either the mapping data from the actual channel to the "virtual" channel is incorrect, or you can't get a good signal from the transmitter.

Going back to my question. Which of the OTA locals give a signal and which do not?

I have a real basic question.  While this is getting ironed out, why not connect the antenna to the TV then you can get whatever is sending a signal.

I do note that for a total of eight stations, there are nineteen channels required.  That is a graphic representation as to why this sub channel thing is a mess.  Multiply this by all the DMA's in the country and the scope gets really big.

Do I understand that chittyb is no longer a Directv subscriber? 

This will be my last posting,dcd is correct I am now with another satellite carrier whose box also receives and puts on the screen all the ota broadcasts from our Mt Kanarra transilator, which is something that Directv NEVER did.   Tribune supplies the same information to both companies. ON top of that I also get the local markets HD off the satellite.  Getting th local market HD from two sources is very handy as sometimes our local tower is down the signal can be received off the satellite, similarly at times the satellite signal is down because of the weather we get signal from the tower.  When the signal is down from both the tower and satellite it means 3 feet of snow is on our roads.....Because Directv chose to not send me new equipment (HR-24) the 24 month service agreement extension is null and void.

Just FYI, and for other readers of this thread, the service agreement extension has nothing to do with whether you get new equipment or not. If you get additional HD equipment, there is a 24 month contract extension whether the equipment is new or not. DirecTv does not guarantee the additional equipment will be new, or what it will be. . If you REPLACE existing equipment, there is no contract extension.