C. Summary of Results In summary, no major shipping channels are impacted by rectenna placement. Even minor impacts could be reduced in some cases if further investigation shows that rectennas could be moved to areas labeled ’’danger zone,” "dumping grounds,” [15] etc., or are used to cover groups of hazards since such areas are already avoided by mariners. However, sea depth impacts on rectenna sites may require the use of floating rectennas or the relocation of some sites. IV. CONCLUSIONS Both land and sea sites have advantages and disadvantages. One advantage on the land is the ease of power transmission from a land rectenna into the national power grid (Figs. 43 through 49). Also, land rectennas may encounter less rust and collision problems than sea rectennas. Furthermore, the slight temperature increase under the rectenna could provide longer growing seasons for any crops planted there. Some disadvantages to land sites include the facts that they force people (although relatively few) to give up their homes and property and may require the costly rerouting of roads. In addition, land sites often must deal with greater elevation (depth) changes than sea sites and could be damaged by hurricanes, earthquakes, tornadoes, floods, etc. Sea sites have many advantages and may even produce benefits. Sea rectennas could aid mariners by providing navigation assistance and by covering submerged hazards. They could be beneficial to fishermen by providing artificial reefs where fish could live and breed in water slightly warmer than the surrounding sea. Also, sea rectennas do not affect private property or require the building of new roads. However, the effects of saltwater, hurricanes, rough seas, ships in a fog, seaquakes, etc., could provide a more hostile environment for rectennas in the sea than on land. Many of the problems mentioned can be circumvented through planning and design. The land site selection criteria already attempts to minimize population, intensive land use, and transportation impacts along with elevation variations. Future work will use topographical maps and census data on actual population distribution in counties to fine-tune locations. Furthermore, rectenna design and operations schemes can help to minimize problems. For example, rectennas should be designed to avoid the clear cutting of land, and a rectenna
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