Design Idea: For Wireless Cell Repeater

"One outside and one inside... not very powerful and best when directly wire connected to the cell phone..."

"One outside and one inside..." Of what? I assume you mean your house, since you claim that it is, " best when directly wire connected to the cell phone...

What's the point?

This is meant for any enclosure; house, apartment, garage, warehouse, wehicle, boat, RV, whatever

I am thinking about this for a FM Broadcast low power iPod transmmiter. Transmit on one freq. receive then transmit on another freq. Or build a simple RF power amp <1W.

It isn't easy like building a signal booster or repeater for a standard one-way analog radio or TV signal due to the way the cell phone signal is transmitted between radio cells (but it is possible). You need more than just an amplifier, like you need more than just a coax cable to link two computers together (eg- network cards, software, etc). There is a reason these cell phone repeaters are more expensive than standard radio or TV signal repeaters.

http://en.wikipedia.org/wiki/Cellular_network

http://en.wikipedia.org/wiki/Cellular_frequencies

http://en.wikipedia.org/wiki/Global_System_for_Mobile_Communications

http://en.wikipedia.org/wiki/General_Packet_Radio_Service

There are kits and designs available, try Googling "building cell phone repeater" and "building cell phone booster".