The old sign
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source)
You could see it from almost anywhere in missoula.
It's an old microwave relay antenna to the bitterroot. The paint apparently does not affect operation.
The peace sign appeared and the phone company painted over it about a week later. Another week later the peace sign was back. And it got painted over again. And again and again. Apparently, the "vandals" started to stick around after painting it so they could get arrested and, therefore, get credit. After a while, the phone company decided to leave it.
When the time cam that the phone company didn't need it anymore, they auctioned off the sign. You can see a piece of it at rockin' rudy's.