> Has anyone ever tried transmitting from above water to underwater and vice
> versa?

The Militery do it all the time

> I am thinking of using 2m amateur transceivers on either end, and
> I'm wondering what kind of range I can get with a couple of watts.

It's like bouncing light off a mirror,

>  Also, if
> I put one half of the antenna (either ground or radiator) in the water,
will
> that make a difference?
>
Errrr. Could I suggest that you look at the ARRL Antenna Handbook or
thinking about it, any Amateur Radio Handbook that covers Antenna basics,
look for Mobile Antenna's

Regards

Chris Carr

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