The antenna housing is held down over the electric bits with a thin sponge like gasket. If it was removed for wrapping top, then it may not have been put back on with the proper gasket. The gasket is not sold separately. One buys the whole kit--then it has to be painted or wrapped before re-attach.
Guess is, they may not have secured properly, and used a sealant that possibly let go. Get a new kit, and have it properly mounted using the sealant gasket provided. In meantime, keep the open covered. One can use RTV sealant, but if you get overage on it oozing out? well, it's not as neat a finish.
