+1 cdwilliams1 said.... 2.4ghz has a ridiculous range, no need for a long antenna protruding from the car. coil or route the wire within the body or battery box, and have the antenna tube be as short as you'd like. the long tube is really for folks running 27mhz.
any yes, never cut it. i have 3 receivers in my tool box that my boys wanted to "cut" for that factory, stubby look