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_ . <br />� � j� , <br />� � <br />���1�1��T��i� ���1NI�I����TI�w� E�1��NEE�t� • E�� fiE�T L�����t��l�� <br />�$'� H�m� li�� ��r��� N�rth, �f���e�rl��, N� N��1 � <br />��1-���-��� * F�x ��1-'��-'#5�� <br />April 21, 2010 <br />City of Arden Hills <br />Meagan Beekman <br />City Pianner <br />1245 West H ig hway 96 <br />Arden Hills, MN 55112 <br />Dear Ms. Meagan Beekman: <br />I have reviewed the coverage studies for locating the Clearwire system on the two city <br />water as opposed to using the Reiling tower. The antenna heights available on the two <br />water towers are lower than the height on the Reiling tower. This difference would limit <br />the coverage area. The Reiling tower would also provide line-of-sight coverage for the <br />req u i red m i crowave syste m. <br />In comparing the coverage maps from Clearwire and me, the differences can be <br />attributed to the fact that my maps did not consider effects caused by seasonal foliage <br />differences or building penetration attenuation. This is due to the fact that data bases for <br />these issues are not on available and the differences in phone models quality were not <br />considered due to the wide variations in performance. <br />Additionally, my coverage maps used signal levels that were selected to highlight the <br />potential poor coverage areas and did not consider the overlap areas that could cause <br />interference between Clearwire sites that they had to consider for their overall system <br />performance. <br />If you have any questions in this matter please contact me directly. <br />Sincerely, <br />� � <br />� <br />� <br />� � <br />� � <br />Garrett Lysiak, P. E. <br />