Raspberry Pi and RTL-SDR over TCP-IP

for my own reference

1. Install a Raspi image on the SD card;

2. Set up the Raspi OS "as usual";

3. sudo apt-get update

    sudo apt-get upgrade

4. sudo bash

    apt-get update

    apt-get install cmake -y

    apt-get install libusb-1.0-0.dev -y

    git clone git://git.osmocom.org/rtl-sdr.git

    cd rtl-sdr/

    mkdir build

    cd build/

    cmake ../ -DDETACH_KERNEL_DRIVER=ON -DINSTALL_UDEV_RULES=ON

    make

    make install

    ldconfig

Run it with

   rtl_tcp -a {IP Address}

Strange Frequency Hopping

I reached my second location, outside the noise of the city.
Here, my SDR works beautifull and revealed me a whole new world of signals!
I saw a strange frequency hopping signal. On both, vertical and horizontal antennas the signal is strong suggesting it came from CIS because the signals from West Europe are stronger on the horizontal antenna than the vertical at this hour.

So, here are the pictures:

Does anyone have ideea about what is this?