I agree, probably a monolithic RF amplifier instead of an RF transistor. RF amplifiers are so cheap these days, and easy to use. Try Mini-Circuits, or Mini-Circuit Labs. Look under "Amplifiers", go to "Monolithic" and look up ERA-1+. That's JUST AN EXAMPLE... Look at the opposite side of your part and see if there is a logo similar to Mini-Circuits logo, or perhaps an actual part number? Good luck.