You can get to the radio tower in HeartGold by going to Goldenrod City and if you go there there is a daily drawing corner and a quiz to get the radio card. If there is someine blocking you, then go to the underground shop, get the Team Rocket uniform, and they shall let you in.
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You dont, you go to the radio tower in kanto and get the pokeflute sound on ur radio
Whitney is in the radio tower. She is trying to get the radio card. You have to beat the quiz and she will return to her gym
Do you mean the Power Plant? Are you looking for the way to activate your radio in Kanto? That can be done at the Power Plant.
You need to get a Team Rocket-outfit which can be obtained in the underground road in Goldenrod just south of the Radio Tower. After obtaining this you can access the other levels of the Radio Tower. After that it is pretty straightforward.
you need to fly to goldenrod city and battle team rocket in the radio tower