Low-power collinear 2.4Ghz Antenna measurements
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here are the measurements. I'll send the drawing seperatly. I took photos.
If you would like to use them you can get them tomorrow.


Length of brass tube segments                   5.55 cm

From end of tube to 1st winding                 6.15 cm (1/2wave)

From center of coil to end of
brass rod                                       3.07 cm (~1/4wave)

From end of 1 tube to end of
next tube                                       9.80 cm

Length of coil                                  1.60 cm

End of decoupler to end of brass
connecting rod                                  6.15 cm (1/2wave)

end of decoupler to inside bottom
of decoupler                                    2.00 cm

Length of decoupler                             3.00 cm

Length of knurled band on decoupler             0.50 cm

Length of female N conector                     2.20 cm

Total length of unit                            50.3 cm

Outer dia. of decoupler                         2.54 cm (1 in.)

Outer dia. brass rod                            0.40 cm ~

Inner dia. brass rod                            0.20 cm ~

Windings per each coil                          4 ~ (1/4 extra turn ?)

Length of each winding                          .3 to .4 cm ~

outer dia. of coil                              0.60 cm

inner dia. of coil                              0.40 cm ~ (~ outer dia. of
brass rod)