You go to lavender town for Kanto and Goldenrod for Johto
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in the radio tower
There is no basement in the radio tower. If you are referring to the underground tunnels it is located near the Name Rater's hut.
you have to go to the old ghost tower, east of vermillion city, it is now a radio tower and they will give you a Kanto radio chip for your pokegear.
go to goldenrod city.
The Radio Tower is in Goldenrod City, so that means you'll need to fight your way there.