What are they used for?
They can be used for many household items such as (but not limited to): Radios (obiviously), TVs, Wifi, and Cordless Phones. They are the weakest form of EM waves. They're strong enough to use, as well as being weak enough to not cause as much harm as gamma rays.
Electromagnetic Spectrum: Radio Waves
A New Technology- The New Radio Wave Circulator
A new radio wave circulator can double the wireless communication speeds by transmitting and receiving signals on the same frequency at the same time. The difference from the old circulator is that this one doesn't require the use of a magnet, which makes the device smaller and more cost-effective. The magnet also limited the communications to only a two-way signal at one time on one frequency, but now that that's gone, multiple signals can be used on one frequency.
The circulator was created at the Cockrell School of Engineering by a team of researchers led by Professor Andrea Alu. A prototype was created, and articles about it went up on November 10th, 2014. It was created using common and inexpensive materials such as copper and silicon.
The new circulator can increase bandwidth speeds by 2x the original speed for mobile devices. That makes download speeds a lot faster, as well as internet browsing, and other things. The circulator is also a lot cheaper, which could make the price of phones go down significantly.