I am thinking that it is possible to get an HR22-100 on an 18 inch round dish since I read another site where someone else was able to do this but wanted to make sure because someone is wanting to take a dish with them when they go to the fair in their RV. Also, does it need to have a signal in order for him to be able to view his recorded programs? I know it will not receive HD programming or locals on it but he only cares about the SD programming and those recorded shows while he is at the fair.