南韓一名男子於當地時間週一晚間約18時30分在首爾江東區騎乘機車時，路面突然塌陷，他隨即跌入坑中。搜救人員於隔日（週二）上午11時左右，在他跌落地點約50公尺遠處的地下發現遺體。

BBC報導，事發當時一名開車的駕駛也在事故中受傷。整起事件在南韓社群媒體上瘋傳。一段廣為流傳的行車紀錄器畫面顯示，事故發生在一處路口附近，地面瞬間坍塌，騎士當場跌入天坑，前方一輛汽車則驚險閃過。

根據當地媒體報導，搜救人員週二早些時候在坑洞中發現了該名男子的手機與機車。該天坑直徑約20公尺、深約20公尺。

本篇文章引用自此: https://www.chinatimes.com/realtimenews/20250325003333-260408
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.
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.