I’m hoping you got Satellite pointer, the better app IMO (on iOS anyway). I’ll keep going under that assumption. If you have not already go ahead and set some satellites as favorites (gold star) on the list of satellites, then in settings select the option that allows only favorites to be viewed. Then, I would just stand under the dish, get your phone as close to the dish as you can, point the camera where the dish is pointing and take a screenshot. Not a foolproof method, but may give you an idea if there is a LOS issue