Yes! For those not familiar with radio, HF (high frequency) is a frequency range that's higher than what's used for AM broadcast and lower than FM broadcast. Much lower than frequencies used in WiFi and cell phones.

What makes it interesting here is that it's a frequency range that is commonly-used and that also propagates in modes other than line-of-sight. For instance 'groundwave' propagation curves around the Earth because of induced currents in the Earth.

This allows HF communication over the horizon. Enthusiasts are regularly able to make contact between continents with amplifier power of less than 5 Watts.