Yess thats true because if they are the same frequency as other radio broadcasts tehn they will interfere with each other!!
Also terrie, only certain wavelengths of radio waves are good because they can defract around objects easily !!! so anything higher menanig with a shorter wavelength will make it harder to defract round objects !!!!!
Exactly but ususally instead of radio waves they prefer microwaves because they wont be defracted as much as radio waves ===> shorter wavelength means your coming closer to microwaves so instead they just use microwaves but the idea behind it is rightlike u said about high frequency and shorter wavelegnth etc etc