[Electron]

All outside coax cables are suspect of being bad , the matching transformer that connects the antenna to the coax that connects to the the preamp is suspect of being bad. All other out side connections are suspect of being bad. My self and question askers have said , " I know that matching transformer is Ok " . "I know that section of coax is Ok". " I know that preamp unit is Ok at the antenna , I know that power supply in the house for the preamp is Ok". One way to prove out the reception is to connect a known to be good matching transformer to the antenna and a known to be good long length of coax from the matching transformer DIRECT to the Tv through a open window or open door.