A proposal by the US regulator, the FCC, to open up a small sliver of midband spectrum for sharing between government incumbents and commercial operators, has caused a stir far greater than its 5 MHz size seems to warrant. This is for two reasons. One, it indicates a willingness to push the sharing model, pioneered in the CBRS band and the TV white spaces, into more of the midband spectrum which is so prized for 5G. The USA is at a serious spectral disadvantage compared to China and many other markets, because so much of its midband airwaves are occupied by federal, local government or satellite users, and moving these incumbents to alternative bands would take many years. Sharing, then,…