The USA’s second millimeter wave spectrum auction for 5G networks looks set to raise more money than the first one. The 24 GHz sales hit $526m in bids on Tuesday March 19, having started on the previous Thursday. Its predecessor, in 28 GHz, raised a total of $702m when it concluded in mid-February. The second auction was expected to be more fiercely contested, because far more of the licences on offer cover major metro areas, which were largely absent from the 28 GHz sale. Since these high frequency bands are mainly of value for densification, because of their short range, urban licences are essential, unless a company wants to major on the other significant use case for mmWave 5G, in…