Are you talking about getting local channels where your home is at or local channels to where you are traveling to. For instance; if you want to receive Dallas Texas channels you can do that in the Dallas area but if you travel to Denver Colorado you will no longer be able to receive Dallas TV, you will only be able to receive Denver TV.
All local channels are spot beamed so if you go out of the broadcast area you won't be able to receive those stations no matter who you use.
If you have an RV, you can file paperwork that will allow you to receive the National broadcast channels from NY & LA through Directv. No matter where you travel in the US, you can receive those channels because they are not spot beamed. They are broadcast over the entire US.