Yep, as said. Jack up front left, remove wheel. Block or use stand. Remove splash panel as described, remove antenna mounting nut (above fender). Disconnect antenna from radio, tape a strong cord or cable to plug end of old antenna wire, pull old antenna down and out from below fender, tape new antenna wire to cord/cable pull new antenna wire into car, mount new antenna, replace splashguard and plug into radio.
Good luck and cheers Ric