Info on Direct TV service.


I do not have direct tv in my home but used a friends box on a weekend trip. service was fine but was unable to get some chanells , ABC, NBC,CBS. Someone told me it could have something to do with the zip code the box was set up for. i want to get direct tv service for my home and use it in my RV but if i cant get all channels it doesnt seem worth it. any info would help