This video demonstrates how to send and receive OFDM Data with the gnuradio-companion using a bladeRF 2.0 micro xA5.
A whole new set of parameters was need to get a HackRF One to act as the transmitter - the blade values did not work.
The output of the receiver needs to be smooth and about +1 and -1 one volt.
Transmitting and Receiving OFDM Data with the gnuradio-companion