Assertion: radio wave's frequency | /r/HasProperty | lurking around 30 mhz
Facets:
value: during the summer season
type: TEMPORAL
value: on most days
type: TEMPORAL
Source sentences:
text: Observation of radio propagation beacons operating around 28.2 MHz, 50 MHz and 70 MHz, indicates that maximum observed frequency (MOF) for Es is found to be lurking around 30 MHz on most days during the summer season, but sometimes MOF may shoot up to 100 MHz or even more in ten minutes to decline slowly during the next few hours.