You can find the Radio Tower in Golden Rod city (the city with the third gym). How to get all the way up I don't know yet. Long time since I played... Answering that here as soon as I can
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either sprout tower, burnt tower or bell tower,if u use hoenn sound item.
in pokemon heartgold soulsilver games at burnt tower
go t the radio tower and save the manager
To rebuild the Burnt Tower in Pokemon HeartGold and SoulSilver, you must fill up your pokedex. By the time that you finish your national pokedex, the Burnt Tower should be restored to its previous state. However, I am not sure what you can do in it when it is rebuilt.
You have to head to the Burned Tower. Talk to Eusine there, head up by the ladder and you'll fight your Rival. After defeating him go down the ladder and approach the 3 Legendary Beasts. They'll run off and Eusine will come down to talk to you and then he'll run off. Morty will return to his Gym after this and then the guy blocking your way in the Gym will no longer be there.