in the underground tunnel in goldenrod
They're in the Radio Tower. Change into the uniform in the tunnel in the North part of town and go inside.
after beating the seventh gym leader go to the basement of golderod city. Their is a man by a camera in a team rocket uniform. talk to him and he will give you a team rocket uniform. then talk to the team rocket grunt blocking the stairs of the radio tower. (sorry if I spelt the city wrong. it's in the same place as the radio tower)
you get a team roket uniform from the photographer guys in the basement
You can then go into the Radio Tower where the grunt was blocking you. He will let you past if you are wearing the uniform.
Go the the radio tower and talk to the grunt guarding the satircase
He is inside the Lavender Town Raido Tower.
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.
You get it when they take over the radio tower in goldenrod city one of team rocket members gives it to you
Look around the place where the hair salons are. There should be a Rocket Uniform down there.
you enter radio tower then you see a team rocket grunt then you talk to him the your rival will come and blow your cover then you battle every one in the tower :)
their is no radio tower
I have soul silver but I think you talk to a team rocket guard in the radio tower by the escalator