Indoor/Outdoor DVB-T Antenna BLOW 4251# — passive UHF channels 21–69

The BLOW 4251# is a passive indoor/outdoor DVB-T antenna designed for reception of UHF television channels 21–69. It receives digital terrestrial television signals (DVB-T) without built-in amplification and is suitable for locations with adequate signal strength or for integration into systems where amplification is provided separately. The antenna's compact design allows for installation inside rooms or mounted outdoors on a mast or wall, depending on reception conditions and available mounting points.

Advantages

This passive UHF antenna offers a simple and robust solution for receiving DVB-T signals across channels 21–69. Because it has no internal amplifier, the BLOW 4251# avoids potential noise amplification and does not require a power source, which simplifies installation and reduces maintenance. The antenna's design supports both indoor and outdoor placement, providing flexibility to optimise reception by selecting the best mounting location. Its construction is intended to withstand typical outdoor conditions when mounted externally.

Suitable for

• Home television reception in areas with moderate to strong terrestrial signal
• Secondary or portable TV setups (temporary installations, caravans, holiday homes)
• Integration into distribution systems that use external amplifiers or signal boosters
• Rooms where a compact indoor antenna is preferred over a larger rooftop system

Key specifications

• Frequency range: UHF channels 21–69
• Signal type: DVB‑T digital terrestrial TV (passive reception)
• Installation: indoor or outdoor mounting compatible
• Power: passive (no internal amplification or power supply)
• Connector type: coaxial cable connection for TV tuner or distribution system

How to use

Connect the antenna to the TV or set‑top box using a coaxial cable and select the appropriate DVB‑T input on your receiver. For indoor installation, position the antenna near a window or at a higher point in the room to improve line‑of‑sight to broadcast transmitters. For outdoor installation, mount the antenna on a mast or wall bracket, orient it towards the nearest transmitter and secure all connections against moisture. After installation, run an automatic channel scan on your TV or tuner to detect available channels. If channels are weak or missing, consider relocating the antenna or using an external amplifier or distribution amplifier placed close to the antenna feed point.

Usage recommendations

To achieve best results, start by testing the antenna indoors in different positions before committing to an outdoor mount. When mounting outdoors, use weatherproof connectors and tighten fittings to prevent water ingress. If you plan to feed multiple receivers, place any required amplifier as close to the antenna as possible to minimise cable loss. Regularly inspect outdoor installations for corrosion or mechanical looseness and reseal connections if water is observed.