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This paper summarizes the present-day knowledge of ionospheric effects at vhf and uhf, with the exception of forward scattering of vhf radio waves by the ionosphere. The seven effects covered in the paper are: Radar Echoes from Aurora, Radar Echoes from Meteors, The Faraday Effect and Radar Echoes from the Moon, Radio Noise of Auroral Origin, Absorption of Radio Waves by the Ionosphere, Refraction of Radio Waves by the Ionosphere, and the Scintillation of the Radio Stars. Each ionospheric effect has in turn been divided into separate subtopics, and the main results are given in these subsections, with particular emphasis upon providing references to the original papers. In this way the reader wishing to know the answer to a specific problem will speedily be able to find a summary of the main published results in the field, and also be able to learn which papers deal with the particular topic of interest.