The venerable HF dipole has found a new home and purpose in space. The Mars advanced radar for subsurface and ionospheric sounding (MARSIS) on Mars Express uses a simple 40-meter dipole as the antenna for its subsurface sounding radar.

The dual-channel low-frequency sounder operates between 1.3 and 5.5 MHz for subsurface sounding and between 100 kHz and 5.5 MHz for ionospheric sounding. It’s the...

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