Mounting an aftermarket UHF antenna is a pain on any new vehicle (composite and aluminium panels, flush roof rails, tinted glass). Plastic rear spoilers however do also work with capacitively coupled (AKA on-glass) antennas (it acts as a dielectric just like the glass).
For SPA vehicles, the rear camera accessory installation instructions (google to locate on VCC website) provide all the necessary insight to access the spoiler and cabling routing (search for instruction_VCC-461642-29 Rear Camera for the XC60). The media server instructions also show LHS rear trim removal.
Tips:
source and use trim tools LHS flexible duct has space - RHS is very tight.use some magnets to locate the spot, mark and double check prior to install.It's probably much less obtrusive on dark coloured vehicles.remove the whip before carwash.
This antenna has been repurposed from a P80 v70 t5 I bought with it installed many years ago. It still works!
The image was taken with background for good contrast - it's unobtrusive outdoors.
It may also be possible to fit to the panoramic roof glass - but routing the cable is more difficult, and would need first to check the tinted glass doesn't affect coupling.
Sometimes regarded as compromise antenna, they do work well when fitted correctly. They perform poorly when mounted too close to the metal body, the whip is below the roofline, or where capacitive coupling is affected by some tinting / passivated glass. Spoiler mounting avoids these problems and keeps the whip much higher. Wiring and the matching box are concealed (unlike the on-glass installation).
As they are used in professional fitment they are widely available locally. RFI industries (RFI AP454 series) with 0dbi and 3dbi options for PMR, UHF CB, 2m (rare) & 70cm. They are mounted with weatherproof double sided tape (and can be strengthened with silicone) - no holes, removable with CARE (and reusable with new mounting tape).
