Lowest Usable Frequency

Lowest Usable Frequency (LUF)
vs. Thickness of Inversion

Inversion Thickness		LUF
*Feet*	*Metres*	*Band*	*M/GHz*
50	15	µW	11.67 GHz
100	30	µW	3.35 GHz
150	46	UHF	1615 MHz
200	61	UHF	962 MHz
300	91	UHF	464 MHz
400	122	VHF	276 MHz
500	152	VHF	185 MHz
600	183	VHF	133 MHz
700	213	VHF	101 MHz
800	244	VHF	79 MHz
900	274	VHF	64 MHz
1000	305	VHF	53 MHz
1100	335	VHF	45 MHz
1200	366	VHF	38 MHz
1300	396	VHF	33 MHz
1400	427	SW	29 MHz
1500	457	SW	26 MHz

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1999-2000 William R. Hepburn