You can find it in goldenrod city. There is a quiz on the right of the counter in 1st floor and if you answer them, you get the radio card.
At the Radio Tower.
You must obtain a radio card from the receptionist at the radio tower
by getting past him
I'm sorry, but you can't go up in the Radio tower in Silver/Gold/Crystal or SoulSilver/HeartGold.
lavender town radio tower
At the radio tower after you save it from team rocket.
In Gold, Silver and Crystal, the Ghost Tower has been transformed into Kanto's Radio Tower and you will no longer be able to explore it.
I can't remember, but i think you have to go to the Radio Tower in Goldenrod City
if ur talking about the radio tower i think it is yes,yes,no,yes,no
Nothing it,s just for show and tell.
The black tall building with a shop door
To do it in johto just get the card thingy after you get 7 badges but in kanto you cant