I have a roof antenna installed in 1986. Two days ago the TV stopped receiving the signal from Fox TV. Why?

I called the network and was told that there were no other complaints. My neighbor (4 miles away) also with a slightly newer roof antenna, is receiving the signal so the problem is mine. Do I need to get someone roped in and up on the roof to examine the antenna? If it were starting to go wonky, would it drop only one channel?