Hello. I have a circuit that uses a 433 MHz transceiver to transmit data remotely. The transmitter is powered by 12v and the transmitter has a 20cm long antenna. However, when I forget to attach an antenna, unfortunately the transmitter cannot be used at long range as before, possibly the transmitter is damaged. When this happens, unfortunately I have to change the circuit. because I can't find the same transmitter. I have attached pictures of the transmitter, do you think it is possible for me to fix this transmitter? Is there an item I should check or replace? Can you help me?