[leong124]

You are getting a player's position and then check if the player is at that position. That means the code actually check if a player is at his position, which is obviously useless.

For iradio, find it in the filterscripts folder of your server, if you have installed the 0.3d server.
You can set a variable to allow or disallow them to play radio in OnPlayerStateChange (check if they entered/left a vehicle).