One is frequency, the other is bandwidth. So 1.2 GHz of band width in the 6GHz band.

The actual frequency band is 5.925 GHz to 7.125GHz[1] which is 1.2GHz from bottom to top (that is how "wide" the band is)

That spectrum is broken up into channels that can be up to 160 MHz wide which allows for a lot of data all at once, but 6 GHz has an even harder time getting through walls and stuff than 5 GHz does do don't think of it easily covering your house.

[1] https://docs.fcc.gov/public/attachments/DOC-354364A1.pdf

How wide is/are the existing 2.4/5 GHz ISM band(s)?

5 GHz is not ISM, but UNII in USA. Similar.

2.4 GHz has 83 MHz spectrum 5 GHz has 580 MHz spectrum but part of it is shared with radars.

6 GHz is 1200 MHz, double of what we have today!!

40Mhz and 20Mhz

Wrong. 20MHz is the channel width (bonded together to make 40, 80 and 160MHz aggregate channels). There are three non-overlapping channels in the 2.4GHz band (so 60) and "many" in the existing 5GHz allocation. In some countries there's an extra usable channel in 2.4GHz. Once you bloat up to 160MHz (which is needed to achieve the highest marketing speeds) it is hard to find clear gaps in today's 5GHz because it isn't contiguous.

and 80 MHz and 160 MHz

> but 6 GHz has an even harder time getting through walls and stuff than 5 GHz does

I was under the impression that the higher the frequency, the more energy the wave has, and thus does a better job of passing through walls. Is that incorrect?

That is incorrect. If a electromagnetic wave can penetrate stuff is not a linear function. E.g. visible light can not penetrate through a body but higher frequency such as x-rays can, however in the microwave spectrum it's different. Somebody said that short waves are really low frequency and can therefore go around the world, however they can really only do that because they cannot penetrate the ionosphere and are reflected back. In certain parts of the EM spectrum you can make certain assumption.

It's actually the opposite. Shortwave (3-30Mhz) goes around the world whereas a high frequency such as 5G (5Ghz) cell data you have to have a node on every light pole.

Shortwave is 100 to 10 meters wavelength compared to 5G which has wavelengths measured in millimeters.

A radio station emitting long waves can be heard almost anywhere on earth. With poor quality, of course. I used to listen to radio stations at 20 000 km away for fun.

With a decent enough antenna setup, the quality isn't poor. I've had stations come in super clear from eastern europe while I was sitting in southwest Wisconsin using an antenna that was just a bunch of speaker wire thrown up into a tree.

5 and 6 should be similar in terms of range at same power levels. BUT, 6 GHz will have lower transmit power than 5 GHz until database aspect of 6 GHz is built. Still great though..

That's definitely incorrect.