The reason 5ghz drops off faster is due to the wavelength. Since it "bounces" up and down more than twice as fast as 2.4ghz, that means for each meter of travel, it's distance traveled is actually twice as far. Because of that, physical obstructions block more than twice as much of it's signal as well. Additionally anything with a device electronics board will do the same, or worse, because of the components, and the boards themselves, it can depending on the components end up completely blocking the signal. A Microwave will completely block 2.4 ghz, because they run on the same freq, and they are designed to hold it inside so placing your router on one side and trying to use 2.4ghz wifi on the other will not work, and if you DO get it to work, it will be slower than molasses running uphill on a cold winter day.