Radio rings on the world MAP

Hi All

I have over 100 radio sites that I want to put a overlay of radio prediction on to the word map , does anyone know how to do this ?

 see pic for example

Each radio site has a different distance, so I would like to be able to edit the distance.

Also if the site goes down, I would like those rings to disappear.

Many thanks in advance for help on this issue.

Sam

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