Denpa is a home TV recording server that turns a Linux machine and a TV tuner into a private recorder for Japanese terrestrial and satellite broadcasts, with reservations and browser playback. There are no configuration files: plug in a supported tuner and card reader, press scan, and the tuner type, channels, and program guide set themselves up. Reserve from the guide, or save a search as a rule and matching broadcasts record automatically; a repeated episode is ignored after its first airing is captured. Recordings encode to AV1 or H.264 MKV files (H.265 when a GPU is present) with captions exactly as broadcast, and detected commercials become chapters that playback skips entirely. Playback resumes where you stopped, runs at up to double speed, and clips save on the server with captions intact; programs also download to devices for offline viewing. Live viewing runs about a second behind the broadcast: pausing starts chase playback, alternate audio stays selectable, and BML data broadcasting works in the browser. The companion denpa-tv app reaches Android TV and Fire TV through QR pairing, and an API exposes channels, recordings, and audio-only feeds to Home Assistant and scripts. EPGStation and EDCB users can import rules, reservations, and recordings, and the interface stays closed until you open it to trusted networks or protect it with OIDC login. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.