Afternoon cappy, it's quite easy to change it to the 2.4ghz system, if you would like to keep it fairly standard you can buy a new 2.4ghz control board and transmitter off one of the trusted vendors on this site

it's just a case of putting the new board into your tank and it's basically plug and play just a straight swap, or you could go a bit more expensive way such as an ibu or clark board etc but you would have to change some wiring then and also buy a separate transmitter to operate it, HTH
Cheers, Lee.