I have a bat wing on the roof, with a boost inside the coach. It kinda works, but not all that great. Also have a satellite on the roof that does nothing & nobody around here knows anything about it...
Measure them vertically if looking at size difference. The size of the SL5 horizontally is only because of the need to pick up several birds across the arc. I keep an old portable 18" around when the Traveler is tree challenged, and it's happened. Personally I wouldn't buy a Carryout for Directv, 101 is a snap to find. Might be useful with Dish tho.