New owner, exterior seal question

[Kidkraz]

Here's how/where that antenna normally mounted. I would think you can find some vhb (very high bond) tape to reattach it. Clean off the old adhesive and reattach it. Weather the camper is open or closed, I would angle the nose/ front a bit high, so if it rains the water drains towards the rear of the camper.
If I can suggest, add the model and any mods to your signature block.
Welcome to the community.