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Let me cut through the magic for you.
There is no such thing as a "cell phone amplifier".
There is, however a device (and I haven't looked at this one specifically so I can't be sure) that is a passive device.
Basically what they do is simple. You put up an antenna high enough up in the air and that antenna at the bottom, collects your signal and is actually tuned to the band the cell phones are in (800-900 MHZ very wide bandwidth by the way!) and essentially "rebroadcasts" your signal at the top of the antenna.
With LUCK that small amount of signal at the top will make it to the nearest cell tower.
With LUCK the signal coming back will trigger your phone circuits to see good cellular reception.
That's the theory behind it.
I don't know how that particular one works.
These devices really don't amplify anything though - they are passive devices, and sometimes they work, sometimes they don't.
HONESTLY - if you stand near any sort of wire going up in the air (shroud, backstay for example) you ought to see some increase in received signal strength. This is because the RF way up above you is hitting that wire and can be conducted down.
I won't say you're better off doing that, but you should be able to see if such a thing would work simply by standing near a backstay on your boat and holding your cell phone near it.
Ok - I just looked at this device. It is a type of a repeater. (Go back up and read what I said before about passive devices, that is still correct. When you go up on deck you're getting the signal because the stays and shrouds will tend to act as little antennas redirecting some of the signal from up higher.)
This thing.... appears to be a real amplifier system and uses an antenna at both ends. One at the top transmits and receives the signal from the tower.
The one in the cabin picks up your cell phone signal and then rebroadcasts the tower's transmitted signal to your phone.
And the price is almost 500 bucks. For that it better do something!
Rick Donaldson, NØNJY
It's better to be hated for who you are, than to be loved for who you're not.
Let those winds of change blow over my head,
I'd rather die while I'm living than live while I'm dead - Jimmy Buffet