Which ionospheric region most affects sky-wave propagation on the 6 metre band?

What effect does tropospheric bending have on 2-metre radio waves?

What causes tropospheric ducting of radio waves?

That portion of the radiation kept close to the earth's surface due to bending in the atmosphere is called the:

What is a sporadic-E condition?

On which amateur frequency band is the extended-distance propagation effect of sporadic-E most often observed?

In the northern hemisphere, in which direction should a directional antenna be pointed to take maximum advantage of auroral propagation?

Where in the ionosphere does auroral activity occur?

Which emission modes are best for auroral propagation?

Excluding enhanced propagation modes, what is the approximate range of normal VHF tropospheric propagation?

What effect is responsible for propagating a VHF signal over 800 km (500 miles)?