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how close is "live by the ocean?" I assume within a few miles (in other words Seattle does not qualify)
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If your stuff corrodes from salt air, you're close enough.
Thanks for the link to the beamwidth, I overlooked that this morning. Silly me, I looked in the "Specifications" but didn't read the "Overview" carefully. I suspect someone used the verbiage from another model but didn't catch the different BW. I'll notify the marketing manager about it.
Horizontal beamwidth is technically defined as the "Half-Power Beam Width (HPBW)". This is the arc that covers the peak lobe and defines where the reception is 1/2 the peak on either side of maximum, also known as the -3 dB points. A good tutorial is available at
http://www.antenna-theory.com/basics/radPatDefs.php
Should you need the wide BW of a C4 but desire a bit more gain, you can stack two C2s vertically on the same mast and combine them with a reversed splitter and two equal length coax segments. This will compress the radiation pattern vertically and will provide a 2-3 dB increase in forward gain while maintaining horizontal HPBW. This is the same as what happens when we go from our C1 to the C2 UHF loops or from a DB2e to a DB4e.