The heavy pole made of steel and the FM antenna that have been exposed by wind and water got rusty deeply.
Each part of the antenna is rusted.
Hey, this deep red rust seems like an ancient some part.
A bottle for fixing the cable has been folded suddenly when I tried to unscrew the butterfly nut.
The cable in the radiator has screwed off from the driven element as the fixed part made of plastic in the radiator was folded. That is a reason why I came across a bad FM feeling.
Next I looked into the booster unit that was installed on the roof.
When I opened the box, then, the outer case has been torn at the connection point and broken in the end.
Furthermore, brown liquid was leaked from the electrolytic capacitors on the circuit board.
After all I decided to remove the antenna and the booster as I found the plastic part in the radiator of the antenna folded, crushing the case of the booster.
I will replace and reinstall new FM antenna.