Maybe there is and maybe there's not. Sometimes it's is a CxxPshoot. Dig in the caulk and see what you find. If it's not easily accessible then give up and run a new cable. That might mean running a new coax from the antenna and drilling a small hole at an accessible location to route the new cable to the power supply inside. If you run an entirely new cable, make that from the head itself to the power supply and make it RG6. If you do any sort of a patch, it makes no difference if you use RG6 or RG59 as the patch cable.