Propagation Summary :: 430 - 450 MHz (70cm)

The lowest amateur UHF band marks the highest frequency on which ionospheric propagation is commonly observed.
Auroral signals are weaker and more Doppler distorted; the range is usually less than at 144 or 222 MHz.
Meteor scatter is much more difficult than on the lower bands, because bursts are significantly weaker and of much shorter duration.
Although sporadic E and FAI are unknown as high as 432 MHz and probably impossible, TE may be possible.
Well-equipped 432-MHz stations can expect to work over a radius of at least 300 km (190 mi) in the absence of any propagation enhancement.
Tropospheric refraction is more pronounced at 432 MHz and provides the most frequent and useful means of extended-range contacts.
Tropospheric ducting supports contacts of 1500 km (930 mi) and farther over land. The current 432-MHz terrestrial DX record of more than 4000 km (2500 mi) was accomplished by ducting over water.