I'll have a look at that stuff John, thanks. Meanwhile both boats are out o= n the water as of this evening so I brought a portable spectrum analyser & = repeated my tests. No difference,so I guess the presence of water does not = matter. Both antennas have a loading coil built into the bottom. The antenn= a I've been testing with at home is a J pole type & as I said, it seems to = work better. It is of course longer. I'll probably try that antenna in the = boat next. Joe ________________________________________ From: piclist-bounces@mit.edu [piclist-bounces@mit.edu] On Behalf Of John F= errell [jferrell13@triad.rr.com] Sent: 04 June 2014 21:31 To: Microcontroller discussion list - Public. Subject: Re: [OT] Matching an antenna to a VHF TX/RX Ouch! It is an end fed 1/2 wave... I have not had much success with this configuration, but according to theory it should work. It will work with a properly designed auto tuner, but hopefully someone will post here with an actual success story. On 6/4/2014 2:32 PM, Joe McCauley wrote: > Here is one of the antennas.http://www.glomex.it/product_details.asp?id= =3DRA106SLSPB > > The antenna is mounted using this insulated mount to the frame.http://www= ..glomex.it/product_details.asp?id=3DRA135 -- John Ferrell W8CCW "Travel is fatal to prejudice, bigotry and narrow-mindedness=94 Mark Twain -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .