With the nut and bolt removed, insert the crimped end of the UHF extension into the boom of the Main UHF section. Make certain that the short elements of each boom are facing up as shown in the picture at right.
Slip the two booms together aligning the holes where the nut and bolt were removed. Place the short element that was removed with the nut and bolt back onto the boom and replace the nut and bolt as they originally were.
The main UHF boom should now be assemble and all short cross elements on the boom facing up.