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Low frequency radio astronomy (or LF radio astronomy) obviously refers to using the lower frequency portion of radio, but the terms are not used consistently regarding a threshold: I assume there are groups that use the term differently. 350 MHz, or something in that region seems common: in other words, essentially everything lower-frequency than microwave, which includes much of what is termed radio astronomy. For example, Low-frequency Array senses up to 240 MHz. But the term has been used for the lower-frequency end of this range: I've seen 30 MHz cited, which is not far above the low-frequency end of the radio atmospheric window, and much lower could require a space observatory.