i think i figured out whats wrong pype. It sounds like maybe you are using the coax cable for an antenna.
Coax cable is specifically designed to suppress radiation from the coax line (less losses). It is also designed to not accept any interference from outside the line. It is a good thing to use for feeding an antenna, but a terrible antenna, seeing as it will SUPRESS your signal instead of radiating it.
For your antenna, use a piece of wire.
BTW, you are not supposed to be posting here asking for help on something, this section is only for those who have a working circuit that they want to share with others.