content: Unfortunately the 5G industry appetite is virtually limitless, and they are already salivating on frequencies above 100GHz. You can confirm this yourself from this industry document: Potential Candidate Frequency Bands above 6GHz for Future 5G Mobile Broadband Systems:      https://www.ofcom.org.uk/__data/assets/pdf_file/0014/31910/qa-report.pdf I will quote, so you can skip reading the whole thing:     4.2.3 Above 100 GHz – initial perspective Propagation in this range is line-of-sight. This band contains a number of water and oxygen absorption peaks, with a narrow ISM band around the first oxygen peak at 120 GHz in some countries. Point to point links have been demonstrated near 120 GHz and were used as far back as the 2008 Beijing Olympics to carry multiple HDTV channels at 11 GB/s . However device and packaging technologies remain specialised in this range, although silicon circuit working frequency is anticipated to reach 300 GHz by 2030.  At this moment (2019), the FCC has already approved bands in the US that will go up to 71 GHz:  https://www.everythingrf.com/community/5g-frequency-bands