433MHz RF kit transmitter problem

Currently trying to run the basic code given on the datasheet for the module on Arduino. The Arduino is able to produce the correct ASK signal however the antenna is constantly at the power supply. I thought this may be due to the transmitter being unable to oscillate the signal at 5V so I connected it to a 9V supply but that has again just made it stay at the peak power. I’ve already replaced it once so I’m unsure whether this is a short circuit or something more complex.

The receiver works fine as I managed to pick up someone else’s transmitter’s signal.