Configurations for antennas

1. A playback device, comprising:

a housing having a metallic face, the metallic face including an opening;

a first antenna oriented in a first direction on a plate, the plate forming a ground plane for the first antenna, the first antenna having a first slot aligned with the opening, the first antenna being associated with a first frequency; and

a second antenna positioned proximate to the first antenna on the plate and oriented in a second direction opposing the first direction, the second antenna having a second slot aligned with the opening, the second antenna being associated with at least the first frequency, and the second antenna having at least a first portion located at a distance from at least a second portion of the first antenna of one quarter wavelength of the first frequency.

2. The playback device of claim 1 , the second antenna having at least a third portion located at a second distance from at least a fourth portion of the first antenna of one half wavelength of the first frequency.

3. The playback device of claim 1 , wherein the opening has a first dimension substantially equal to one quarter wavelength of the first frequency and a second dimension substantially equal to one half wavelength of the first frequency.

4. The playback device of claim 1 , wherein the plate comprises copper.

5. The playback device of claim 1 , further comprising an isolation slot to isolate the first antenna and the second antenna.

6. The playback device of claim 1 , wherein the first antenna is further associated with a second frequency; and

wherein the second antenna is further associated with the second frequency.

7. The playback device of claim 1 , wherein the metallic face is a speaker grill.

8. A playback device, comprising:

a plate to form a ground plane;

a first antenna on the plate having a first segment associated with a first frequency and a second segment associated with a second frequency; and

a second antenna on the plate having a third segment associated with the first frequency and a fourth segment associated with the second frequency, wherein a first edge of the first segment is located a half wavelength of the first frequency from a second edge of the third segment, and wherein the plate is positioned adjacent an opening in a metallic face having a first dimension of substantially the half wavelength of the first frequency.

9. A playback device as defined in claim 8 , wherein a third edge of the second segment is located a quarter wavelength of the first frequency from a fourth edge of the fourth segment, and wherein the opening in the metallic face has a second dimension of substantially the quarter wavelength of the first frequency.

10. A playback device as defined in claim 8 , wherein a first radiation pattern associated with the first antenna extends in a first direction, and a second radiation pattern associated with the second antenna extends in a second direction opposing the first direction.

11. A playback device as defined in claim 8 , further comprising a first isolation slot located between the first and second antennas on the plate.

12. A playback device as defined in claim 11 , further comprising a second isolation slot located on the plate.

13. A playback device, comprising:

a housing face having a first interference factor, the housing face includes an opening in which a cover is placed, the cover having a second interference factor less than the first interference factor, wherein the opening has a first dimension substantially one half wavelength of a first frequency supported by the playback device and a second dimension substantially one quarter wavelength of the first frequency; and

an antenna board formed by a plate and aligned with the opening, the antenna board comprising:

a first antenna having a first segment to support the first frequency and a second segment to support a second frequency; and

a second antenna having a third segment to support the first frequency and a fourth segment to support the second frequency, wherein the second antenna is positioned in an opposing configuration from the first antenna, wherein a first edge of the first segment is located the half wavelength of the first frequency from a second edge of the third segment, and wherein a third edge of the second segment is located the quarter wavelength of the first frequency from a fourth edge of the fourth segment.

14. A playback device as defined in claim 13 , wherein a first radiation pattern of the first antenna extends in a first direction, and a second radiation pattern of the second antenna extends in a second direction opposing the first direction.

15. A playback device as defined in claim 13 , further comprising a first isolation slot perpendicular to the first and second antennas.

16. A playback device as defined in claim 13 , further comprising a second isolation slot perpendicular to the first and second antennas.

17. A playback device as defined in claim 13 , wherein the first frequency is 2.4 GHz.

18. A playback device as defined in claim 13 , wherein the second frequency is 5 GHz.

19. A playback device as defined in claim 13 , wherein the first and second antennas are slot antennas embedded in the antenna board.

20. A playback device as defined in claim 13 , wherein the housing face is a metallic grill and the cover is plastic.