Funneling is a key element in a security plan. The basic idea is to force intruders to move to specific areas, places where you can have greater control over the situation. For example, if ne’er do wells are moving through your property, you don’t want them hiding behind your outbuildings. Instead, you want to force them into open areas where you can better handle them, using whatever means you feel are necessary.
Here’s how this might work. Let’s say you have a fairly large shed toward the back of your property. It is within sight of the house and you fear someone might use it as cover while scoping out the home. One option might be to place piles of brush or junk back there, heaping it up to the point where someone can’t easily hunker down.
Another option could be to scatter broken glass and metal on the ground, then letting the weeds and grass grow long enough to hide it. Someone who decides to hit the dirt so as to not be seen would be in for a rude awakening. In fact, their shouts might serve as a handy alarm, too.
Yet one more possibility, though it isn’t truly funneling, is to set some sort of motion sensor alarm or trip wire back there. Something that will alert you to the presence of a potential threat in that area. If the alarm is discovered, the person(s) might avoid that area, serving the purpose of putting them out in the open.
Keep in mind, though, that anything you set out in the way of traps and such might also be dangerous to you and your family if folks aren’t careful. The absolute last thing you want to do is have one of your children get hurt because they forgot about the broken glass behind the shed, y’know? Make sure every family member is made aware of any areas where you’ve laid traps or alarms.
There may also be legal issues with some forms of traps. For example, I recall at least one case where a guy had set up a shotgun in a hunting cabin in such a way that if the door was opened the gun fired. It ended up killing someone. If memory serves, the family of the intruder successfully sued the owner. I believe he also faced some criminal charges as well, though I don’t recall how that turned out for him. Suffice to say, you may want to hold off on setting out any lethal methods of funneling until and unless the rule of law ceases to exist.