Not to sound all tin-foil-hat-like but I'm learning about wireless signals and am trying to understand it better. So my question is:
When multiple wireless signals are transmitted at the same time on different frequencies, they end up getting superimposed or combined together to create the field that travels through the air. So if I had two signals at different frequencies whose amplitudes varied between 1 and 0, the combined signal in the air could have an amplitude greater than any signal by itself (In this case, the signal in the air could have an amplitude greater than 1).
Wouldn't that mean if you had a lot of normally harmless wireless devices (say cell phones or wifi routers) in a given area that you could create a region that is no longer safe since each small harmless signal has combined to create a higher powered dangerous one?
Update to add more context:
Outside of even standing waves, if I look at an image like the one linked below, I see points where the red, blue, and green waves are all positive and close to their peaks creating a combined amplitude of around 2.5 times that of any wave by itself. While I can certainly see some waves canceling out because they are negative when another is positive, with the hundreds or thousands of wireless devices saturating an area, wouldn't we still have some decent amount summing to create a much higher level of energy transmission? Or is it simply the power transmitted by these devices is just so low that even with say a thousand devices summing together, it's irrelevant?