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>take two radios
>hand one to a friend
>drive to a flat area with no tall obstructions in two cars
>choose a no-bounce frequency
>drive away from each other until you can no longer connect
>mark the locations on a map
>switch to a taller roof mount antenna
>"oh hai i hear you now"
>drive away from each other until you can no longer connect
>mark the locations on a map
>break out an even taller antenna
>"oh hai i hear you now"
>compare to LoS calculations
>"it's a globe!!!"