Excuse me. I am an accountant. No physics at all. But, is it possible to do outdoor soundproofing? I envisioned a setup of portable poles that could in effect soundproof an area with electonic or magnetic frequencies by blocking or effecting the sound waves coming from that area. Kind of like a cell phone or radio tower only small and portable to move with a truck or buy at Home Depot. They could be used in a small or large area, larger requiring more portable poles or taller poles. Cell phone signals can be blocked, why not sound waves? It would be a great invention for construction zones, highways, racetracks, or my teenage son's garage band. It could also make an outdoor area private like a private meeting room or a wedding. Does the military already have this technology? Is this even possible or have I been watching too much Star Trek? Seems like it could make a million $. Where are the aliens when you need them?