Longley-Rice model works correct in given frequency ranges, antenna heights, distance, surface refraction, as shown in Table 87.
Table 90: Range of ITM model correctly working
Parameter | Range |
Frequency | 20 MHz – 40 GHz |
Antenna height | 5 cm – 3 km |
Distance | 1 – 2 000 km |
Surface refraction | 250 -400 N |