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アンテナ Hi-Z Antennas HIZ-PC-4AのPDF マニュアルをオンラインで閲覧またはダウンロードできます。Hi-Z Antennas HIZ-PC-4A 19 ページ。
This was a pretty successful design but there was another improvement. We began using a ¾ inch OD Fiber
Glass insulator material from McMaster Carr that fit right into the 7/8 inch diameter bottom element