What's the difference between how HF and VHF/UHF radio waves

HF and VHF/UHF radio are both excellent communication tools - in separate applications. What is the difference between how these signals propagate?

AN-100 _HF Multicoupler_3101 - JANADA

LF, HF, UHF Frequency: What's the Difference?

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Frequency Range- ELF, LF,MF ,HF, VHF, UHF, SHF, EHF, ULTRAVIOLET, INFRARED, X-Ray & Application

What is a VHF/UHF Repeater in Amateur Radio? – Johnson's Techworld

Understanding the Differences Between UHF and VHF Bands – Examining UHF and VHF in In-Building Critical Communications

The Radio Spectrum: VLF, LF, MF, HF, VHF, UHF – Elite Commnications & Electronics

Difference Between UHF and VHF Frequencies In Two-Way Radios – First Source Wireless

What Do VHF and UHF Mean? - The KØNR Radio Site

What's the difference between how HF and VHF/UHF radio waves travel? - Barrett Communications

The Ionosphere

Two-Way Radio Antennas and their Different Types – Waveband Communications