Just call DirecTV and order the package you want and a basic (not HD) receiver have it shipped to your home. It is easy to install. We did it ourselves.
Once you activate the receiver and service, you can easily suspend it when you are not using it (with some restrictions): Here's the instructions and criteria for suspension of service: https://support.directv.com/app/answers/detail/a_id/2430
I love DirecTV. One thing: you will not get local affiliate channels if you are over 150 miles from your service address. To get locals, you will either have to have a digital TV and antenna to scan for locals or subscribe to an RV account and pay for NY or LA affiliate stations.