https://www.dxengineering.com/search/part-type/antenna-switches-manual
http://www.universal-radio.com/catalog/switch/2415.html
https://www.dxengineering.com/search/part-type/antenna-switches-manual/product-line/mfj-1704-antenna-switches?autoview=SKU&sortby=Default&sortorder=Ascending
Ten przełącznik z pozycją "com" lub z symbolem uziemienia.
https://www.dxengineering.com/parts/mfj-1704
433.500,145.550,70.260,439.550 Janusz, Barlinek JO72ox