The physical design principles of the old analog TV Antenna and the modern digital broadcasting (DTV) antenna are completely consistent, and both are based on wavelength adaptation. The so-called "digital antenna" or "HDTV Antenna" is mostly a marketing gimmick, and its core performance (such as frequency band coverage and gain) is not essentially different from that of traditional antennas. Key risk: Some sellers claim that "digital antennas are optimized for DTV", but in fact they may only support UHF band, which makes users unable to receive digital channels still in VHF band (such as parts of North America). It is completely consistent with the interface impedance of TV/STB, ensuring zero signal loss and the highest Transmission efficiency, and avoiding signal attenuation or image distortion caused by impedance mismatch. High gain design: 28±3dBi signal enhancement Through the high-sensitivity receiving module and directional optimization structure, the receiving ability in weak signal environment (such as indoor, long-distance or mountainous areas) is significantly improved, and clearer and more stable high-definition pictures are output, reducing problems such as snowflake and ghost. Low standing wave ratio (s.w.r): 1.5: 1 extreme optimization. The standing wave ratio (VSWR) reflects the signal reflection efficiency, and 1.5:1 means only 4% power reflection, which ensures the effective transmission of more than 96% power and avoids equipment damage or reception interruption caused by signal reflection. Third, cables and connectors: the invisible guarantee of signal transmission RG174 high quality Coaxial Cable Low loss characteristics: High density polyethylene (HDPE) insulation layer and tinned copper conductor are adopted, which reduces the signal attenuation rate by 30% compared with ordinary cables and supports long-distance stable transmission. Flexible deployment: 3m cable is standard (5m and 10m can be customized), which is suitable for various installation scenes such as wall hanging, window sill and roof, and avoids signal occlusion or tensile damage caused by too short cable. SMA female connector: both versatility and reliability Industry standard interface: widely compatible with TV, set-top box, signal amplifier and other equipment, supporting fast plug-in and stable connection, reducing the risk of poor contact. Customization option: it can be replaced with F-type, IEC-type, BNC-type connectors according to requirements, so as to adapt to old-fashioned equipment or special scenes (such as monitoring system and radio communication). Physical dimensions and installation design: the balance between compactness and flexibility Ultra-thin compact structure Antenna length: 115mm Size (length× width): 115mm× 65mm. With a thickness of only 12mm, it can be easily hidden behind curtains, beside bookshelves or on the wall, and bid farewell to the visual sense of the traditional "pot-cover" antenna. Multi-angle installation support Support three installation modes: horizontal, vertical and inverted, and adapt to different signal polarization directions (VHF is mostly vertical polarization, UHF is mostly horizontal polarization). Optional accessories: 360 rotatable bracket, users can manually adjust the antenna orientation and optimize the signal receiving angle (especially suitable for complex urban signal environment). V. Customized services: meeting individual needs Band tuning customization According to the signal frequency band distribution in the user's area (for example, VHF-Low, VHF-High and UHF should be taken into account in North America), the dual-band optimized antenna is customized to ensure coverage of all target channels. Professional frequency band detection service: provide free signal analysis tools or on-site detection to help users accurately locate the required frequency band. Sixth, the purchase suggestion: rationally avoid the marketing trap. Beware of the false concept of "digital antenna" Digital TV signals and analog signals are physically transmitted in the same way, and no special antenna is needed. Give priority to products with clearly marked frequency band coverage (such as 174-860MHz). Confirm band compatibility Before purchasing, check the local digital TV frequency band allocation (such as through FCC or official website) to ensure that the antenna supports UHF+VHF full frequency band and avoid missing VHF channel. Focus on core parameters rather than labels Gain (≥8dBi), standing wave ratio (≤1.5) and impedance (75Ω) are key indicators to measure antenna performance, not marketing words such as "digital" and "HDTV". Q1: Can I customize the antenna in a specific frequency band? A: Provide band tuning customization service, and customize the dual-band optimized antenna according to the signal distribution in the user's area (for example, North America needs to take into account VHF-Low, VHF-High and UHF) to ensure coverage of all target channels. Q2: How to avoid buying an antenna that only supports UHF? A: Confirm that the product description clearly indicates "Support UHF+VHF full frequency band"; Reject vague descriptions (such as "high definition antenna" and "digital optimization"); Choose a brand that provides professional frequency band detection services (such as free signal analysis tools or on-site detection). Q3: What parameters should I pay most attention to when purchasing an antenna? A: Core indicator: frequency band coverage (UHF+VHF full frequency band); Gain (≥ 8dbi); Standing wave ratio (≤ 1.5); Input impedance (75 ω). Avoid being misled by non-performance words such as "ultra-thin" and "invisible".
