"Medium Scale" would be a 60 to 90 size model. You can't carry enough payload to do much damage with anything that size. Even if you could, you wouldn't be able to hit within 150 feet of a target unless you are within sight of it. To even get that close, you would have to do quite a bit of test flying and practice, making it likely that you would be discovered before you could carry out the dastardly act. Anyone seriously considering taking out a high profile target would use something much simpler and much, much more reliable than what is available to the model UAV enthusiast.

I suggest you cast your eyes toward Iran and other oil rich countries who hate the American way of life if you want to keep UAV bomb threats in check. We who do this for fun are causing absolutely no harm to our country. If someone wanted to use our limited technology for the wrong reason, I feel sure that after researching what is available they would turn elsewhere for their information and supplies. A guidance system may well be available for the 10 to 15 grand you refer to but that is NOT what modelers are using. Even with this system, you would need an airframe in the 50 to 100 grand range to carry enough payload to cause serious harm. This takes us so far away from what the average model UAV enthusiast is doing that it just becomes laughable.

Your doom and gloom messages are beginning to sound like Chicken Little..

An Enthusiastic Model UAV Tinkerer;

D.W.