Directv in the RV does not work unless we are at home.

What is the model of box you take in the RV?

What dish do you have on it?

You'll have issues like this unless your RV dish is a Winegard Trav'ler or DirecTV SlimLine HD dish. 

Hi, HoopRV. We're sorry if you can't watch TV when you're camping. I'll send you a DM to get this fixed. You may also visit: https://www.directv.com/support/article/000086845 for helpful tips. Alice, DIRECTV Community Specialist

It’s been working for the last year no problem even we go out of state, but having this issue the last two trips.  DIRECTV said they’ve sent us a new box but don’t understand why the old box doesn’t work except for when we’re home

@HoopRV 

DirecTV has been shutting down their MPEG-2/SD-only feeds. This greatly impacts RV users who tend to have older setups. That is why it was asked to know model numbers of your equipment to see if that is the issue or something else.

Working for the last year means nothing as obviously something has changed. Either something about your setup is outdated or you have a technical issue.

Thanks for the information, @Juniper. 
@HoopRV, we've sent you a DM. Please check your inbox to investigate further. Alice, DIRECTV Community Specialist

It’s just weird that when we travel it doesn’t work and when we get home it works just fine.  After being on the phones with DIRECTV when it wasn’t working, they are sending us out a new receiver. We haven’t received it yet.  so I guess we’ll see when we travel in a few weeks if it works away from home

We're sorry for any inconvenience. Please let us know if it works. Alice, DIRECTV Community Specialist

There are multiple satellites. So if you travel an issue might be in one area but not another. That is why getting the specific is helpful to narrow down the cause.

Also you mention "No Signal". Is that the exact error message, as opposed to "Searching for Satellite"? The first one would specifically be from the TV not getting communication from the box, the 2nd is the box not receiving the service (which may be an issue with the receiving dish).

If you please answer the questions asked we shall give you as specific guidance as we can.

The receiver is an H 24-200, the dish is an oval HD dish.

The first time it was working for two days and on the third day, it just stopped working.  it would say to check all the cables that something wasn’t connected or when we reset everything we will get the 711 code then it would go back to telling us to check all the cables

Thank you for the information, HoopRV. The error 711 means your service isn't activated. We want to take a closer look into this. Let's meet in DM, so we can check your account. Alice, DIRECTV Community Specialist

711 is Service Not Active.

771 is Searching for Satellite.

No Signal is from the TV itself.

If it is 771, I would also check that there is no damage to the LNB or receiving dish. A better signal acquisition at home might make up for the issue then when you're traveling.