of course a roof top tent will hurt performance. (Not to mention fuel economy) If you load anything over the antenna it will lower the range and quality of the signal. Better not drive through a tunnel either if you don’t want to miss your favorite song playing on the radio. It comes down to personal preference.. Do I want to outfit my vehicle with certain equipment to benefit a specific trip and impact performance or is satellite radio a non negotiable. But you can can’t say OP setup will keep him from getting from A to BOf course you can load over it, but it will impact the performance of the antenna and associated equipment. As you can see in the picture, that tent folds up and stops blocking antenna when you are on the move. Roof rack in OP would provide no such relief while moving from A to B.