Bifiliar Antenna Design

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Job Description

Hi There:
Looking for someone to design a bifiliar helical antenna with the following specs:

1. Stainless Steel Construction
2. 245-315 MHz
3. 12.5 dBic gain @ 280 MHz
4. VSWR = 1.5 Max
5. Beamwidth = E Plane 34 degrees H Plane 43 degrees
6. RHCP
7. Input connector = N-Female