How to create a Wireless RF circuit activated by an ultrasonic sensor for interesting project?

Thanks, yes I know there is a lot of bad info on YouTube although there can be a good nugget of info on there sometimes, but it is very time consuming to try and find it. I have watched many videos by Paul McWhorter which have been helpful, but thought I would explore the forums for additional guidance.
I will download the libraries of both and have a look to see whether I can make sense of them and experiment. Thanks