If you have an unused hole from a previous antenna (or whatever) use one of our snap in hole plugs to seal it up. The HPA-L (large) hole plug package holds 2 plugs for 3/4" holes and 2 plugs for 7/8" holes.

(2) Plugs will fill in 3/4" Holes
(2) Plugs will fill in 7/8" Holes