Wireless networks already have to deal with increasingly crowded waves, and that's only going to get worse when 5G rolls around. Any boost to the signal could lead to a big jump in performance, especially when you're using very high frequencies that are more prone to interference. But how do you provide that boost? Researchers have an idea: 'hover' the antenna. They've developed millimeter wave antenna arrays that are almost entirely separated from the substrate you'd usually mount them on, preventing that substrate from weakening the signal like it does with conventional antennas.