Hams allocated 23,350 MHz

The good news: U.S. Radio Amateurs have frequency allocations (primary and secondary) of 23,350 MHz. (Primary allocations add up to 4,791 MHz.)

The less good news: 23,300 MHz of the total is allocated above 1 GHz, but 22,700 MHz of that is above 10 GHz, and 16,750 MHz is above 100 GHz.  Little day-to-day amateur activity takes place above even 1 GHz, but there is important experimentation in these regions.

Just a few tidbits from www.spectrumwiki.com.

By the way, these allocations would support about 7.8 million simultaneous SSB conversations at any given location.

Spectrum and Band Occupancy

Dan, KB6NU, has some good reasons to worry about 300-3000 MHz competition for amateur bands.
Image via Wikipedia
Right on.  At least frequencies below 300 MHz are under less pressure, which is a relief to us HF & 2M troglodytes.  Still, vigilance is required.  Support ARRL.

There is a problem with the VHF and higher bands that doesn't get a lot of attention.  Amateurs are not very good at utilization.  The bands are almost always completely empty, and this makes them targets for commercial use.  Around here in CT, the 2M repeater segments are mostly allocated and unavailable for new applications, but they are still unused most of the time.

Image via WikipediaBy contrast look at 14.070 - 14.073 kHz. I can often copy dozens of PSK31 QSOs in progress there in 3 kHz of spectrum.  Also look at the cell/CDMA bands that support 100s of "QSOs" in a few MHz all the time.  Hams do need to pay more attention to band occupancy.