isolation between two adjacent and similar elements is approximately 13 db if two different elements are used as in fig1 the isolation is approximately a minimum of u2212 15 db the substrate bottom face 100 b is most clearly shown in fig2 a the substrate top face 100 a is most clearly shown in fig2 b the four exemplary top face antennas 22 and 23 are designed to cover at least three different operating frequencies of various wireless standards the diagonally opposed zigzag serpentine antennas 22 are capable of covering the lower frequency bands around 780 mhz the diagonally opposed f shaped antenna elements 23 can cover two higher frequency bands the two sets of opposing reference plane extended arms 50 enhance the isolation between adjacent elements the split 90 in the reference plane provides an additional isolating feature the main broad rectangular reference plane portions 60 are also shown in fig2 a each antenna element along with its ground plane occupies approximately twenty five percent of the total area of the substrate in the embodiment shown this gives a total area of 25 u00d7 50 mm 2 this embodiment of a mimo antenna 5 may have alternative ground plane geometries that can be used on the bottom face 100 b of the dielectric substrate as shown in fig3 a through 3f as shown in fig3 a ground plane configuration 305 a has a copper clad major arm 350 in the middle of each reference plane i e the two ground planes in the upper left and lower left quadrants of fig2 a have been merged together medially and the two ground planes in the upper right and lower right.