You get it when you get your 7th or 8th gym badge. I think its 7 though. Hope I helped. :)
Pete
In Johto the radio tower is in goldenrod near the top to the left near the game corner place , and in Kanto the radio tower is in lavender town
Johto's radio tower is in Goldenrod City, at the Northwest end.
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You beat Team Rocket in the Radio Tower. And then the Owner of the Radio Tower or whatever he is gives you the Rainbow wing at the top of the Tower.
In the basement under Goldenrod city mart when Team Rockets invade the radio tower.
Go up all of the stairs in the Radio Tower until you reach the top floor.
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.
The Radio Tower.
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in the radio tower
Talk to the person behind the counter in the radio tower and answer the questions. You get a radio card thing for your pokegear and then Whitney leaves.
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.