張嘉男／綜合報導
2日下午不少桃園、新竹地區的民眾都表示聽到 「轟～轟～」的不明巨響，甚至連玻璃都因此晃動，對此立委林為洲給了大家答案，原來是湖口訓場基地近日正在實施戰車砲單位測考，早中晚皆有實施射擊測考，因近日濕度比較低和風向因素，砲聲會傳得比較遠。
昨天下午包括了大溪、大園、內壢、霄裡等地區，甚至連新竹的民眾都紛紛表示，聽到不明巨響，有人以為是不是春雷到了天空在打雷，還驚動氣象局出面回應，表示桃、竹一帶，一整天都沒有下雨，也沒有打雷跡象，民眾聽到的巨響與打雷無關。
對此立委林為洲在臉書發文，表示自己陸續接到許多民眾反映聽到巨響跟感到震動，湖口、竹北、新埔皆有鄉親詢問發生什麼事？他請鄉親們放心，經詢問國防部了解湖口訓場基地近日正在實施戰車砲單位測考，早中晚皆有實施射擊測考，#因近日濕度比較低和風向因素，砲聲會傳得比較遠，全民國防，請鄉親們安心。
The log-periodic antenna as known as LPDA is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies.
Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas.
The log-periodic dipole array typical VSWR is 2:1 and operates over a much wider bandwidth and will have a lower gain for an equivalent number of elements.
In terms of its specification, a typical log periodic antenna might provide between 3 and 6 dB gain over dipole for a bandwidth of 2:1 while retaining a VSWR level of better than 1.3:1. With this level of performance, it is ideal for many applications, although a log-periodic antenna will be much larger than a Yagi of an equivalent gain.
EMC/EMI pre-compliance test antenna.
Very high gain over the full frequency range.
Meets latest EMC standards up to 7GHz.
Suitable even for immunity measurements
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