Holes in fiberglass panels can be repaired to remove holes and other features.
The video below demonstrates that fiberglass work can be accomplished in a home garage without too many special tools. Quality supplies are important, and getting the details right will make for an excellent repair.
Removing the antenna from a fiberglass bodied Corvette is accomplished for a cleaner, simpler look. These sorts of projects are relatively straightforward and can be easily accomplished.
From youtube user 71corvette
This instructional video illustrates the complete process of repairing and filling holes in fiberglass body panels.