My Hy-Gain TH6DXX antenna has been up on a tower about 20 years, with excellent results. Suddenly, the gain of the antenna is off the side; in other words, when the boom is broadside to the transmitting station, and the element ends are pointing at it. Just 90 degrees off of where it has been and where it should work. This is verified in any direction.
The SWR of the antenna is excellent. I have tried different frequencies in the different bands and the results are the same.
Anyone have any guesses to what has happened?