These sites that I found ( I searched for metal.aluminum CB whip antennas) may help with what you are looking for! Good Luck!
Not legal. FRS radios by regulation are not permitted to have external antennas. GMRS Radios (commercial grade, not FRS/GMRS combo units) CAN have external antennas. Remember, GMRS requires an FCC license though.
There are cell phone booster devices out (Tiger Direct sells them) and most are under $200. Its a box you plug in an outlet and thats it. These are nice for boosting cellular signals in steel and cement office buildings, etc. There are also external ...