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If you had your choice of antenna with these options on VHF which would you choose and why, Exposed Dipole at 6db omni 16 degree vertical beamwidth, Exposed dipole bi-directional at 8.5db 16 degree vertical beamwidth, Collinear omni stick at 6db 16 vertical beamwidth, 5db 18 degree vertical beamwidth, or 4.5db 22 degree vertical beamwidth pros and cons antenna looking from around 1600ft at tower centered and need to talk 20km far end of needed talk area with some mountains 1200ft elevation below antenna and down as far as 600ft asl. What are your thoughts?