not that hard .
mine was broken when i bought my car
theres a bolt in the door jam area that holds the lower portion of the antenna assembly , remove that
loosen the plastic inner fender liner and remove the lower fender bolts (turn tire fully right or better yet remove it it will be easier )
then disconect the anntenna wires and antenna leadin under the hood(tape a wire or rope to the antenna connectors to make pulling the new wires up easier)
remove the mast nut at the fender top and lower the antenna assembly out through the wheelhouse , you will need to pull out the bottom of the fender a little but it should come out easy enough .
tape that rope to the new leads and pull the new wires and antenna assembly back in to place and lightly reinstall the upper mast nut at fender top and then the install in the door jam bolt to the lower antenna bracket , once youve got those done you can bolt the rest all back up,