----- Original Message ----- 
From: "Marcel Birthelmer" <marcelb.lists@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Tuesday, January 24, 2006 11:12 PM
Subject: Re: [EE] 2.4 GHz over water???


Could you have some sort of antenna below the water level? I'm not sure what
the specifics would be, but given that sound travels so much better
underwater, it might be an option.
- Marcel

I'm afraid that all frequencies higher than around 20 kHz have so high
attenuation in the medium water that is only useable for submarine boats and
transmitters with ultra high power. A transmission antenna with gain for 20
kHz for submarine transmission is in dimensions of Kilometers...

Enrico

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