if its just hte rubber seal you can slip it over the top
if you want to remove the whole aerial base yes headling has to come off i believe.
i replaced my rubber seal, stuck it in some warm/hot water to soften it then slipped it over. it seemed to warp and move around for the following few days but seems to sit nicely now.
Tim at Dubaddiction sells the seal/gasket im pretty sure.
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