Long range rf communication device for PCB
You can't just go broadcasting the kind of power it takes to go 2 km (I'll assume for now that's what you meant by "KM") in a urban environment at 433 MHz.  There are laws about how much power you are allowed to emit at what frequencies, and what licenses might be required.

The ISM band at 434 MHz is very limited in the allowed transmit power.  It is also limited to rather low duty cycle and repetition rate, especially for unattended instruments.  You get a few 10s of ms every 10 seconds if I remember right.  I was envolved with a product that used this frequency, and its effective RF range was about 100 feet.

This answer is to say you're a long way from slapping something on a board.  You need to stop and learn what exactly you're allowed to do, with and without a license, before you proceed.