What does the red mean? Height?

[v0031]

There’s a town in America where there is no Wi-Fi - and no smartphones
Imagine travelling back in time 30-odd years, to a point where people didn’t spend the whole day staring at their phones and swiping at Facebook.
But you don’t actually need a time machine to get there: a small American town has no smartphones (in fact, no mobiles at all), no Wi-Fi, and no radio.
Green Bank has a population of 143, and is known as the Quietest Town in America – and its residents enjoy the enforced lack of technology, describing the town as an ‘oasis’.
The reason for the ‘radio silence’ is the nearby Robert C Byrd Green Bank telescope — a 485-foot sensitive radio instrument which listens for distant signals.
The telescope can pick up signals as faint as ‘about a billionth of a billionth of a millionth of a watt’, experts say.


Caliber or height?

Ana what does this god damn a billionth of a billionth of a millionth mean?

[True Federalist (진정한 연방 주의자)]

It's 485 feet high.  A billionth is 10^-9, so a billionth of a billionth of a millionth is 10^-24.  I can understand why they didn't simply say a yoctowatt, as even most scientists would need to look up the obscure yocto- prefix.  Why they didn't use the simpler a trillionth of a trillionth is not so understandable. (Septillionth is also fairly obscure, tho not as obscure as yocto-.)

[Meclazine for Israel]

Haha.

Western Australia has one of the quietest electromagnetic regions on the planet.

It's called the Murchison.

Enforced lack of Wi-Fi as well.

[Grumpier Than Uncle Joe]

v, were you in Mar A Lago with President Xi's delegation?