Dual band sleeve dipole antenna

An antenna comprising:

• a housing composed of a dielectric tube;
• a center-fed coaxial dipole having a first element and a second element for radiating and receiving cellular transmissions in a plurality of frequency bands;
• the second element comprising a first portion and a second portion, whereupon the first element, the first portion and second portion each have a length equal to approximately one-quarter wave length of approximately the mid-range of each frequency band,
• the first element configured as a whip;
• the first portion configured as an inner conductive cylindrical sleeve coaxially aligned with the whip;
• the second portion configured as an outer conductive cylindrical sleeve coaxially aligned with the inner sleeve and the whip;
• a coaxial conductor having inner and outer conductors and being axially aligned with the dipole and extending through the second element of the dipole;
• the inner conductor being electrically connected to the whip and the outer conductor being electrically connected to the second element;
• a coaxial choke formed of a cylindrical sleeve of electrically conductive material disposed about and axially aligned with the coaxial conductor with the choke having a length equal to approximately one-quarter wavelength of the frequency at approximately the mid-range of one of the frequency bands;
• a first end of the choke remote from the dipole being connected to the outer conductor of the coaxial conductor;
• a second end of the choke nearest to the dipole being spaced from the second element by a distance equal to approximately one-quarter wavelength of the frequency at approximately the mid-range of one of the frequency bands.
• a top insert proximally disposed on the housing in contacting engagement with the whip;
• and
• a bottom insert distally disposed on the housing having the coaxial conductor pass therethrough.