A directional planar log-spiral slot antenna comprising: a container; a log-spiral slot antenna comprising a feed-point configured to transfer energy to and from said log-spiral slot antenna, log-spiral shaped slots that begin at said feed-point and spiral outward and away from said feed-point toward an outer portion of said log-spiral slot antenna, an antenna impedance; a radome that covers the log-spiral slot antenna, wherein said radome is coupled to said container; an internal enclosed volume bounded and enclosed by said container and said radome; a cavity directly beneath said log-spiral slot antenna; an energy absorbent backing; at least one support; an energy absorbent siding situated between the container and the log-spiral slot antenna wherein said energy absorbent siding is coupled with said container and with said energy absorbent backing and further coupled with said log-spiral slot antenna, wherein said cavity is bounded on sides of said cavity by said energy absorbent siding and below by said energy absorbent backing, and wherein said log-spiral slot antenna is coupled to said at least one support and wherein said at least one support is coupled with said container through said energy absorbent siding; wherein said cavity is behind said log-spiral slot antenna and in front of a portion of said energy absorbent backing; a cable connector having an input impedance wherein said cable connector is coupled to the feed-point; and, wherein said container is configured to hold said log-spiral slot antenna, said energy absorbent backing, said energy absorbent siding, said cavity, and said cable connector. a container; a log-spiral slot antenna comprising a feed-point configured to transfer energy to and from said log-spiral slot antenna, log-spiral shaped slots that begin at said feed-point and spiral outward and away from said feed-point toward an outer portion of said log-spiral slot antenna, an antenna impedance; a feed-point configured to transfer energy to and from said log-spiral slot antenna, log-spiral shaped slots that begin at said feed-point and spiral outward and away from said feed-point toward an outer portion of said log-spiral slot antenna, an antenna impedance; a radome that covers the log-spiral slot antenna, wherein said radome is coupled to said container; an internal enclosed volume bounded and enclosed by said container and said radome; a cavity directly beneath said log-spiral slot antenna; an energy absorbent backing; at least one support; an energy absorbent siding situated between the container and the log-spiral slot antenna wherein said energy absorbent siding is coupled with said container and with said energy absorbent backing and further coupled with said log-spiral slot antenna, wherein said cavity is bounded on sides of said cavity by said energy absorbent siding and below by said energy absorbent backing, and wherein said log-spiral slot antenna is coupled to said at least one support and wherein said at least one support is coupled with said container through said energy absorbent siding; wherein said cavity is bounded on sides of said cavity by said energy absorbent siding and below by said energy absorbent backing, and wherein said log-spiral slot antenna is coupled to said at least one support and wherein said at least one support is coupled with said container through said energy absorbent siding; wherein said cavity is behind said log-spiral slot antenna and in front of a portion of said energy absorbent backing; a cable connector having an input impedance wherein said cable connector is coupled to the feed-point; and, wherein said container is configured to hold said log-spiral slot antenna, said energy absorbent backing, said energy absorbent siding, said cavity, and said cable connector.