Problem with Sending AIS Messages

[denizea]

Hi @zhudsonSM, @cvanslyke, @nazmibojan and all! :)
I know this is warming up an old topic again, but after many hours of debugging, I am not really able to receive AIS messages.
I am using HackRF One to transmit messages. As @cvanslyke , I both tried Gnu Radio gui and generated python code. On the receive end I am using RTL-SDR and running piece of software called rtl_ais. When I go to next to a boat, I am able to receive AIS messages from a transmitter on the boat but when I try to to send ais messages from HackRF, I am not able to receive messages.
I have 2 good marine antennas on both end, and when I transmit, I can see on spectrum analyzer by Universal Radio Hacker something is transmitted on 162 MHz. However, on receive end I can not read the message.
Here are my GNU Radio building blocks.

Do you have any idea, what could be wrong? Huge thanks!

[unxs0]

I am interested in helping debug this issue. Cheers!