A decimeter is one-tenth of that, namely, 3.937 inches; and a decameter 39.37, or ten times the meter, and so on.
"Practical Mechanics for Boys" by J. S. Zerbe
Ryabov, et al., 1997, Groundbased high sensitivity radio astronomy at decameter wavelengths, in “Planetary Radio Emissions IV”, H.O.
Motivation and possibilities of affordable low-frequency radio interferometry in space
The probability of detection of the anomalous intense pulses thus does not exceed several percents at Decameter wave range.
On the Present and Future of Pulsar Astronomy
These sources include brown dwarfs such as BD LP944−20, from which radio ﬂares have recently been detected (Berger et al. 2001), and Jupiter, which has long been known to emit radio ﬂares at decameter wavelengths (Aubier et al. 2000; Lecacheux et al. 1998).
Searches for Fast Radio Transients