The main power beam at the space station peaks at an intensity of 32 mW/cm2. Power density is collected on the rectenna out to a 15 m radius, leaving the remaining low level energies of the mainbeam and sidelobes uncollected. The percentage of transmitted power received for this 5.8 GHz configuration has fallen from 89% (without tilt) to 88%, while grating lobes peak magnitudes have increased from below . 1 mW to a value of 1 mW/cm2. The safe environmental limits for exposure to low level microwave energy are not well known at present, as is indicated by the wide disparity between USSR and U.S. microwave standards (.01 and 10 mW/cm2). Grating lobe peaks on the order of 1 mW/cm2 (the same intensity as near sidelobes),
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