Originally Posted by osirissail
With that I would respectfully disagree as I have built very high gain directional wifi antennas before the commercial
versions were available and had to constantly re-aim the antenna every time a puff of wind turned the boat.
- - It is logical that if your directional antenna is pointed at a shore wifi source and the wind turns the boat - the antenna is no longer pointing at the shore source and you lose the signal. If you didn't then the antenna is omni directional.
It is certainly OK to disagree, and I suspect that the difference could be in a number of areas. Anchorages
differ as well as wind and current
conditions. Also there isn't a directional antenna for wifi that I know of (even theoretically) that produces a pinpoint signal at any distance. They all have some spread so antenna design, while still "directional" will provide varying degrees of coverage at distance.
In practical use our cantanna over performed our store bought yagi. There were times when it could sit on the cabin
top or clamped to the canopy for hours without having to be re-aimed. There were other times when I would have to hand aim the thing while Kerri downloaded our email
reports. But (and it's a big butt) without that antenna we would not have got those weather
reports or emails.
There were other times when it wouldn't do the job at all and at those times, and for that matter always our first choice, we have a 15dbi omni (also widely reported to be useless at anchor).
And we still use our Alfa usb devices on shore-side excursions although I have a little something-something up my sleeve for that to be announced a little later.
So I say, vive la différence!