The rotation of the earth (and the SPS) means that no portion of the sky will be permanently excluded from RF astronomical observations and if the rectenna is far from navigable water, there should be no problems with shipboard radar. However, the tropo service will be adversely affected in the vicinity of the rectenna. There should be no biological health problems due to the SPS RF energy transport. The 230 w/m^ is <23 percent of the sunlight energy transport at the earth's surface and ^4.2 percent of RF energy transport in a microwave oven. The 2.45 GHz is approximately an order of magnitude below the rotational frequencies for many molecules (H2O, 0^, etc.). Finally, the usual limit for continuous human exposure to RF energy is 100 w/m2, only a factor of 2.3 lower. Thus, while humans and wild animals should stay away from the rectenna area as much as possible, transient exposure should pose no problems. Plant life is not expected to be noticeably affected (RF, like nuclear radiation, affects animals more than plants).
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