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Old 10-13-2010
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Quote:
Originally Posted by Bene505 View Post
That's true if your antenna is at a different height that the shore-side antenna. If there are surrounding cliffs, for instance with houses on top.

That's less true is you are purely concerned about pitching* at anchor. Then extra beamwidth will really help you. I find that our boat doesn't pitch that much usually. (50' boat, 10 foot water depth, 3 miles of fetch, monohull.) But the 30 foot boats around us have pitched up and down 20 degrees from horizontal in a blow. (Remember Mainsails videos of anchorages up there?) That's not the normal conditions at the anchorage, but it is a time when you would want connectivity to see where the storm is going.

As another thought on this, the TCP/IP protocols have some provision for lost packets, IIRC, so if you have the occasional extra pitch, you may still have service -- it simply retransmits that part of the packet that was lost.
Only for TCP connections, not UDP ones.

Quote:
Boats usally don't rock (actually roll) at a mooring/anchor as much as they simply pitch with the approching wind swell. That is, unless you are exposed to swells at your anchorage, in which case you may actually need a big verticle beamwidth to accomodate more intense rolling.

I believe that for 95% of what I need, a high-gain, omni-directional antenna works best. 12 db is great. I'd go even higher (and narrower beamwidth) if I could.

Regards,
Brad

This is why I generally recommend a NS2 type device rather than a Bullet with Omni setup for most monohulls.
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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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