An impressive back-scatter radar on 49.9 MHz is currently being constructed in Ethiopia.
The Bahir Dar coherent backscatter radar is being assembled by researchers from the University of Oulu, Finland and Boston College, USA.
The radar will operate at 49.9 MHz with a 16 kW solid-state transmitter and 64 antennas. The sampling is based on a number of USRP X300-series boxes (the USRP was developed by Matt Ettus N2MJI).
Backscatter radar http://blog.sgo.fi/2014/11/bahir-dar-coherent-backscatter-radar.html
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Sodankylä Geophysical Observatory