The problem with radio transmissions in the EHF band is that they are incredibly line of sight (LOS) restricted. Any structures or vegetation between the client and access point will block the transmission. It is also highly susceptible to rain fade. And while 73 GHz is above the atmospheric oxygen attenuation death zone (57–64 GHz), it is still highly affected by atmospheric absorption. Range for a point-to-point (PtP) system is a kilometer or two at most with sane ERP levels.
There are already a couple of manufacturers who make PtP wireless network devices for the 60–80 GHz band, but they're mainly used for short distance backhaul networks. They're less expensive substitutes for running fiber between buildings or across a campus. The idea is that you have your PtP backhaul running at 10, 24 or 60–80 GHz and then you communicate with your clients using a PtMP network in the UHF band using WiFi, WiMax or LTE.