Assertion: radio antenna | /r/HasProperty | designed as half-wave dipoles
Facets:
value: at 7 mhz
type: TEMPORAL
Source sentences:
text: For instance, amateur radio antennas designed as half-wave dipoles at 7 MHz can also be used as 3/2-wave dipoles at 21 MHz; likewise VHF television antennas resonant at the low VHF television band (centered around 65 MHz) are also resonant at the high VHF television band (around 195 MHz).