tag:blogger.com,1999:blog-1608381420022248590.post3645665455538524428..comments2024-03-26T15:49:53.549+00:00Comments on EI7GL....A diary of amateur radio activity: Slim Jim Vertical Half-Wave for 27 MHz & 28 MHzJohn, EI7GLhttp://www.blogger.com/profile/02903298584057380083noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-1608381420022248590.post-56847141645848331192022-01-20T16:48:15.599+00:002022-01-20T16:48:15.599+00:00I have been building J pole antennas for 11m yrsss...I have been building J pole antennas for 11m yrsss now .... I build it from Aluminium tubing , starting with 1 1/4 at the base --- Longest element = 28 feet ( 1 foot for mounting ) -- Radiating portion = 27 feet ..... Shorter element = 9 feet ...... Spacing between elements = 5 inches ...... I did build one for 28 mhz and worked Japan with it with only 100 wattsAnonymoushttps://www.blogger.com/profile/13774746975006409578noreply@blogger.comtag:blogger.com,1999:blog-1608381420022248590.post-47320811133289282402017-01-13T19:19:56.876+00:002017-01-13T19:19:56.876+00:00Thanks for the link Bas. That looks like a really ...Thanks for the link Bas. That looks like a really nice version. <br /><br />I think one of the biggest problems with a vertical on 10m / 11m is the mechanical strength in the wind. 8 metres is a lot for a vertical antenna without supports. <br /><br />Nice price too! :o))<br />John, EI7GLhttps://www.blogger.com/profile/02903298584057380083noreply@blogger.comtag:blogger.com,1999:blog-1608381420022248590.post-77930756118908238972017-01-13T14:44:43.449+00:002017-01-13T14:44:43.449+00:00Hi John, just for info. There was a commercial 11m...Hi John, just for info. There was a commercial 11m slim jim made here in the Netherlands for a short time. See: <a href="http://www.hpsd.nl/contact/j-pole" rel="nofollow">http://www.hpsd.nl/contact/j-pole</a>.<br />It could be a interesting view for mechanical reasons. I know this antenna works very well compared to a endfed 1/2 wave for example. The advantage is in the height as this design is 8m long!<br />73, BasPE4BAS, Bashttps://www.blogger.com/profile/12958141238330445285noreply@blogger.com