The Traveler roof top is specific to the either Dish or DirecTV, two different sets of satellites used and different equipment to access either.
The Dish antenna is less expensive then the DirecTV.
The basic parts (base) are the same and parts can be changed to make them work.
You can go from Direct to Dish, not sure about the other way.
Look at this site
https://rvseniormoments.com/tech-docs/dish-tv-for-rvs/directv-to-dish-travler-conversions/
If the control box works and operates the antenna, after locking on DirecTV will show SATs 99 - 101 - 103 (these numbers are the elevation in degrees and how the SATs are labeled for basic use).
Dish may provide higher numbers and fewer satellites, like 119
And there are two different types of DirecTV antennas, the actual dish and the LNB, which is the small receiver on the end of the antenna arm.