Abstract: A wireless signal level indicator includes at least an antenna signal processing module, a signal level indicator (SLI), and a power supply module. This invention provides an innovative two-stage filtering technique; first, the low-pass filter (LPF) of the antenna signal processing module is used to filter out high-frequency signals that are not used by digital televisions; then a high-frequency pass filter (HPF) of the signal level indicator is used to filter out low-frequency signals that are not commonly used by digital televisions. In this way, the signal of the usual range of the general digital television can be selected, and this invention can produce a low signal loss and low noise factor wireless signal level indicator at low cost.

Abstract: A car antenna assembly includes an outer cover, an antenna unit, a fixing seat, a locking bar, a control board, and a base. The antenna unit is made of a metallic strip which is bent freely to form a plurality of antenna elements which are connected successively. The outer cover covers the antenna unit and the fixing seat. Thus, the height of the antenna elements is increased gradually from the front end toward the rear end of the antenna unit, while the antenna elements have a constant spacing so that the bandwidth of the antenna elements is increased so as to increase the receiving effect of the AM and FM signals. The car antenna assembly has a shark fin shape to reduce the air drag and air shear noise.

Abstract: An antenna device includes a support pole, a fixing seat mounted on the support pole, at least one clamping member mounted on the support pole and combined with the fixing seat by at least one locking bolt, and an antenna box mounted on the fixing seat. The fixing seat is provided with a square mounting sleeve which has a mounting chamber and two opposite fixing holes. The antenna box has a square insertion block inserted into the mounting chamber. The insertion block has a plurality of adjusting holes. Thus, the orientation of the antenna box is adjustable so that the antenna box can be disposed at a horizontal position or a vertical position so as to receive a wireless signal exactly and clearly.