UserInputService

local userinputservice = game:GetService("UserInputService")

local player = game.Players.LocalPlayer

userinputservice.InputBegan:Connect(function(key)
    if key.KeyCode == Enum.KeyCode.R then
        if player.PlayerGui.Radio.Frame.Visible == true then
            player.PlayerGui.Radio.Frame.Visible = false
        else
            player.PlayerGui.Radio.Frame.Visible = true
        end
    end
end)