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?

The Ionosphere

What's the Difference Between VHF and UHF Two-Way Radios?

SWS - Other Topics - Introduction to HF Radio Propagation

Radio Electromagnetic Spectrum Frequency Bands - RF Cafe

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

Frequency Bands for Radio Frequency Range

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

What is the relationship between AM/FM and VLF, LF, MF, HF, VHF, UHF in plain terms? - Quora

Electromagnetic (EM) Spectrum 1. Medium Frequency (MF), High Frequency

HF radio becomes low-cost alternative to satellite High-frequency radio - Urgent Communications article

A Modern HF/VHF/UHF Transceiver for All Applications – What Would it Look Like Today?

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

What is HF radio?

An Introduction to High Frequency Radio Communications and ALE - ppt download