Will my magnet-mount antenna work if placed on a non-metal surface? weBoost Support - September 09, 2016 17:25 Related articles With a glass-mount antenna, what is an acceptable temperature range of the glass for installation? Using Other Antennas for Vehicle Boosters Can I place the magnetic mount antenna on the trunk deck of my car instead of the roof? What to do if my vehicle's body is aluminum? Where should I place the device antenna for an indoor cell phone signal booster system? No. A magnet mount antenna must be placed on a ferrous metal (iron or steel) surface for it to work.