It seems the package rtl-airband-rb is not available in RB24 repository for bookworm and bullseye. I could find it only in RB24 repository for buster, that also armhf architecture.
Anyhow I downloaded the rtl-airband-rb armhf package and installed it on my RPi 4 with Bookworm by following method. As I don't have airband dongle, I could not test if it is functioning OK.
Please also see screenshot attached below
STEP-1
wget https://apt.rb24.com/pool/main/r/rtl-airband-rb/rtl-airband-rb_0.1.1-2020061700.1_armhf.deb
sudo dpkg -i rtl-airband-rb_0.1.1-2020061700.1_armhf.deb
The second command above will give following message, listing dependency packages required to be installed to complete the installation:
dpkg: dependency problems prevent configuration of rtl-airband-rb:armhf:
rtl-airband-rb:armhf depends on libconfig++9v5 (>= 1.5-0.4~).
rtl-airband-rb:armhf depends on libmp3lame0 (>= 3.100).
rtl-airband-rb:armhf depends on librtlsdr0; however:
Package librtlsdr0:armhf is not installed.
rtl-airband-rb:armhf depends on libshout3 (>= 2.2.2).
rtl-airband-rb:armhf depends on libstdc++6 (>= 5).
rtl-airband-rb:armhf depends on libvorbisenc2 (>= 1.1.2).
dpkg: error processing package rtl-airband-rb:armhf (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
Issue following command to install dependencies and complete installation
sudo apt -y --fix-broken install
STEP-2:
After installation is completed, you can open configuration file by command below and make necessary settings:
sudo nano /etc/rtl-airband-rb.conf
After modifications, save the file and restart rtl-airband-rb
sudo systemctl restartt rtl-airband-rb