Directional Yagi Antenna: Buy in Nairobi, from Pro-Logic Technologies
When maximum signal strength matters — in rural areas, fringe coverage zones, or locations requiring long-distance reception — nothing outperforms a properly installed directional Yagi antenna. Named after Japanese engineer Hidetsugu Yagi, who co-invented it in 1926, the Yagi-Uda antenna remains one of the most effective antenna designs ever developed. Pro-Logic Technologies in Nairobi supplies Yagi antennas for demanding TV, radio, and communication applications.
The Anatomy of a Yagi Antenna
A Yagi antenna consists of three types of elements arranged along a central boom. The driven element (or dipole) is the only element directly connected to the feed cable — it’s the element that actually receives the signal. In front of the driven element are one or more directors, which are shorter elements that focus the antenna’s beam in the forward direction. Behind the driven element is the reflector, a slightly longer element that prevents signal reception from the rear.
This elegant arrangement creates a highly directional antenna with significant gain — the antenna is far more sensitive to signals arriving from the front than from the sides or rear. The more director elements the antenna has, the narrower and more focused the beam, and the higher the gain.
Why High Gain Matters for Reception
For DVB-T2 digital TV reception, signal level must exceed a minimum threshold for the decoder to lock onto the signal and display a picture. Below that threshold, there is no picture at all — digital signals don’t degrade gracefully the way analogue ones do. In marginal signal areas, the extra gain of a Yagi antenna can mean the difference between a perfect picture and no picture at all.
A typical indoor antenna might have 0–3 dBi of gain. A good outdoor log-periodic might reach 6–10 dBi. A Yagi with multiple directors can achieve 12–17 dBi or more — a dramatic improvement that translates to reliable reception over much longer distances or through much more challenging terrain.
Mounting and Aiming
Because of their directionality, Yagi antennas must be aimed precisely at the transmitter for optimal performance. A signal strength meter (covered later in this guide) is an invaluable tool for this process. The antenna should be mounted high, with a clear line of sight in the direction of the target transmitter, and secured firmly against wind loading.
📞 Call or WhatsApp: 0723 763173
Maximum reception, maximum gain in Nairobi — Pro-Logic Technologies.