Ht-12E & Ht-12D

Hello, I bought the IC-12E & Ht Ht-12D, my intention is to control radio frequency for a mini car ..

here is the link of the RF circuit:
**broken link removed**

my doubts, this is just to have 4 RF outputs, and I precizar, 6. . . 2 or more! = |

I wonder if I could amplify the RF output with some Demultiplexer for example ..

need of your suggestions!

The transmitter has a single 433MHz RF output, not 4 outputs. It is modulated with data and the receiver decodes the data into 4 functions.
If you amplify the 433MHz output then the receiver might be overloaded when close and not work.
It is illegal to amplify its 433MHz because it will cause interference to other communications.