What is a characteristic of HF communication compared with communications on VHF and higher frequencies?
HF antennas are generally smaller
HF accommodates wider bandwidth signals
Long-distance ionospheric propagation is far more common on HF✓Правильный ответ
There is less atmospheric interference (static) on HF
Объяснение
HF signals are readily refracted back to earth by the ionized upper atmosphere, which makes worldwide contacts an everyday occurrence on those bands. VHF and higher frequencies normally pass through that region and are limited to roughly line-of-sight ranges.