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Are there any cost effective and simple ways to impede radio and similar signals? On a scale of say 2 feet, 5 feet.. small :) something you could say place near a radio antenna or cell phone that would stop reception?

checking the thread on 'what do you use your ebay 405nM for,' the only mention of focusing the lens indicates the end had to be hacked off. i tried taking it apart from the inside but didn't like my chances. has anyone managed to focus the lens on one of these without cutting it? nice item...

okay.. itfp, pls don't make fun of me :) due to my erudition i have always found physical sciences challenging.. eg. raised by a spiritual family i wasn't able to integrate with my science courses in school. i've hacked dozens of circuit bending electronic projects for music but failed to grasp...

i've been looking at lasers online for several days now and much of the marketing and information seems fairly dubious. i would like a pen/pointer laser powerful enough to be annoying. i have a noisy bird that likes to make noise outside my window. it doesn't have a nest or food supply there...