RECOMMENDATION ITU-R BS.598-1 - Factors influencing the limits of amplitude-modulation sound-broadcasting ... ANNEX 1 1 Introduction 2 Definition of coverage factor 3 Coverage factor c as a function of the distance D between co-channel transmitters 3.1 General 3.2 Results obtained for a plane Earth model 3.3 Results obtained for a spherical Earth model 4 Coverage factor as a function of channel spacing 5 Conclusions ANNEX 2 - Practical aspects of MF broadcasting coverage 1 Day-time coverage 2 Night-time coverage 2.1 Ground-wave coverage at night 2.2 Sky-wave coverage 2.3 Combination of ground-wave and sky-wave coverage 3 Combination of day-time and night-time coverage 4 Population coverage 5 Improvements of coverage 5.1 Synchronized networks 5.2 Antenna directivity 5.3 Relative merits of antennas with horizontal and vertical radiating elements 5.4 Low-power stations ANNEX 3 - Approximate day-time coverage ranges ANNEX 4 - Approximate night-time coverage ranges ANNEX 5 - Coverage obtained from synchronized transmitters