2.4 Ghz was chosen because it has interference from microwaves: http://www.wired.com/2010/09/wireless-explainer/ http://www.wired.com/2010/09/wireless-explaine

2.4 Ghz was chosen because it has interference from microwaves: http://www.wired.com/2010/09/wireless-explainer/ http://www.wired.com/2010/09/wireless-explainer/ The "imaginary problem" (I don't know how imaginary it is) is people modifying software so that their devices interfere with other, licensed frequencies. Personally, I don't think there are many people that will buy an SDR and amplify the signal outside of legal ranges. I also think that any people that will do that are also capable and willing to that without the convenience of SDR. I can imagine this theoretically being a problem with wifi routers: "Download this custom build of OpenWRT and this custom wifi driver, and you can get wifi without interference from your neighbors".