Anyone up for a challenge? Need help finding a sub for this MOSFET ERF7530

Hi all. There is a MOSFET in a TO-218 package that is being used as an RF amplifier in two way radio applications. I believe that it is just a re-labeled part, as the company that sells them is not a manufacturer. This part has become unavailable from them, but i think that it is probably a much more commonly available part that was just re-labeled and re-purposed for use in an RF amplifier circuit. here is the datasheet: http://www.ralphselectronics.com/ProductImages/SEMI-ERF7530.PDF hopefully there is someone here who is adept at interpreting datasheets and can tell me what part the ERF7530 really is. thanks in advance!