[TowerTalk] Anti-climb measures

[Alan AB2OS]

What, if any, measures are people taking to prevent the neighborhood 
kids climbing their towers, with possible resulting falls, injuries (or 
worse), and lawsuits? AN Wireless lists an anti-climb accessory for 
$450, but I can't see why one needs anything that expensive.

This area has plenty of kids and few fences (except around pools), so I 
do need to take some precautions.

Alan AB2OS