Exactly my sentiments.If someone is tampering with it, the spider is one of the easiest to restore.
And i wouldn't be surprised if they would just destroy something more solid with more force.
If someone wants to do damage to an antenna installation, they'll find a way.
If you see the picture here, someone is actually taking the trouble of climbing the ladder to the very top.
(Point to note, the antenna is mounted not where intended on the picture, but the diagonally opposite corner (closest to the airport) + least restrictive view of the horizon.)