pic #1 shows the brass tube blued into a balsa block that will glue into the fuselage. You will note that about 1/16 of an inch of brass tubing protrudes above the balsa block. This will insert into the fuselage sheeting when installed.
pic #2 shows the mount installed in the fuselage. You will note the brass tubing that comes up to the outer skin of the fuselage.
pic #3 shows the antenna mast installed.
pic #4 shows the antenna mast being inserted into the mast mount.
pic #5 shows the antenna mast being used to remove the main hatch.