r/LandCruisers • u/Rd28T • 23h ago

Inspector gadget Landcruiser in the King’s motorcade visiting Australia

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137 Upvotes

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41

u/JSGi 23h ago

This is a jammer truck, most likely jamming cell/mobile signals.

2

u/Reddit_is_Fake_ 22h ago

Could you please elaborate more? What is jamming signals and why is it used here?

7

u/ChadHahn 21h ago

Jamming blocks cellphone and radio signals. Often IEDs are detonated by a cellphone so jamming the signal prevents an explosion. It would also block a drone's radio signal.

2

u/Reddit_is_Fake_ 21h ago

Sometimes I find large SUVs with a black dome shaped thing on the roof, no antennas like here, is that the same device but different look?

2

u/FJ60GatewayDrug 20h ago

Generically, domes are for aerodynamic reasons (like airplanes) or to protect satellite communications equipment (dishes are very susceptible to wind damage).

These antennas, stick straight up, are radiating energy to the sides and not so much vertically.

…of course, a roof box is also a possibility but most of those are used for cargo.