I recently replaced the GPS module inside the shark fin as per the walkthrough on here.
It recommended placing silicone around the base to create a tight seal. I put silicone around the 2 bolts area and the black bracket. Thought all was good and the back pillar head lining is wet. When pulling the roof lining down it's clear it's coming from the aerial. Took the shark fin off again - no mean feat as it was well and truly stuck in place from the silicone, and now applied silicone around the whole outer perimiter of the fin. and still the back pillar head lining is wet.

How much silicone do i need to put there, thought i was already liberal with the amount i put there.

cheers
steve 2019 RRS P400e Autobiography
2014 RRS 3.0 TDV6 HSE Dynamic
2006 RRS 2.7 TDV6 HSe
Alfa Romeo Guillietta 2.0 JTDM 2011
Mazda 3 1.6 2010
Subaru Impreza 2.0 WRX 2005

If you used ordinary silicon ie bathroom sealant it's not up to the job what you really need sikaflex or tiger seal and put it round the base as well. If it ain't broken down it soon will
Pulling my Vanmaster tin tent with my 2005 RED RRS HSE TDV6
1973 Land Rover Series 3 110 safari Gone but not forgotten
1990 Discovery 200Tdi Gone thank god
1996 Discovery 300Tdi sadly missed
2003 Discovery TD5 Gone to LR heaven
2004 Discovery TD5 Gone to Aberdeen hope it likes it there
2005 RRS HSE Rimini Red (my Disco 3 in a posh frock) sadly selling
Think I see a pattern here