[Discuss-gnuradio] Intra-body communication with USRPs

Now I'm trying to make an intra-body communication system
Thus I'm looking for freq. characteristics of the human body

I found something like below:

http://dl.dropbox.com/u/11382666/methods.png

Here are 3 methods.

The question is that if I tried to make the intra-body communication system with 2 USRPs,

What does this system correspond with?

I'm not pretty good at CIRCUITry... and internal structure (schema) of USRP

If someone has idea with it, I appreciat it in advance.

Thank you