I just took the nut off that holds the spring clip on. It's super tight so make sure you have the appropriate size wrench/socket to avoid stripping. I also bought an antenna protector that replaces the nut because the antenna easily snaps if it gets banged around. I bought leg mount rechargeable batteries so I could switch from backpack to leg mount. You might need to buy a leg mount cap if you don't have one. The cap threads are different from the RT series so don't try