Aerial is loose on top of van. Wobbles from roof mount. Any suggestions how to fix please. Being female Im not sure where to look for maybe screws missing

You do not state type of Aerial or age. There are many U Tube videos on pulling apart and reassembling Wineguard aerials (most common van aerial). You will need to access top of your van so ensure roof is capable of standing your weight.

Thanks. Will try utube