Sorry that it has stopped working. You have not given us enough information to point you in the correct direction to fix it.
Let's start simple:
do you hear static from the uBitx with the antenna connected, and nothing when the antenna is disconnected?
If so, then the audio sections are OK and we will need to go on to the RF and IF sections.
It would also help to know what type of test equipment that you have and what may have happened between the time it was working and now.
Let us know.