1. Department of Physics, University of Ghana, P. O. Box LG 63, Legon, Accra, Ghana
2. Ghana Space Science and Technology Institute, Ghana Atomic Energy Commission, P.O. Box LG 80, Legon, Accra, Ghana
3. The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada
4. Hartebeesthoek Radio Astronomy Observatory, PO Box 443, Krugersdorp, 1741, South Africa
5. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
6. SARAO, 2 Fir Street, Black River Park, Observatory 7925, Cape Town, South Africa