tv tuner for raspberry pi 4

  • I had recently purchased a USB TV tuner for my Raspberry Pi 4, which is connected to my TV. I don't keep my Pi connected to the internet, So I connected the Ethernet cable to the Pi for temporary uses. I went to Add-ons and scrolled down to the PVR client and installed the Tvheadend applications. I connected the USB TV Tuner and rebooted. I connected the antenna and then went to Live TV on the Pi, but nothing shows up. Do I need to install something else?