Assertion: radio wave's frequency | /r/HasProperty | ground penetrating
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Source sentences:
text: Band name Frequency range Wavelength range Notes HF 3–30 MHz 10–100 m Coastal radar systems, over-the-horizon (OTH) radars; 'high frequency' VHF 30–300 MHz 1–10 m Very long range, ground penetrating; 'very high frequency' P < 300 MHz > 1 m 'P' for 'previous', applied retrospectively to early radar systems;