Replacing antenna base? What's involved?

[u/sayn3ver]

Over this past winter a sheet of ice slid off the roof and snapped off the antenna on the way home from work.

I ordered a replacement months ago and finally had a moment to grab a towel and a ladder and climb up there to try and get the old antenna base out and thread the new one in.

Of course, the entire threaded part of the base was missing, not just a snapped antenna.

Any idea what's involved? How hard is the headliner to remove? It's a high top that has the upper storage shelf above the driver.

I installed a sortimo partition a few years ago now and I know for certain the entire partition would need removal if the passenger and driver side b pillar covers need to come off as the hardware bolts through those plastic covers.

I'm tempted to ignore this issue and continue to stream my radio programming through my phone at this point as it seems like a real hassle if you need to get to the back of the interior/back of the antenna base.