Thanks, Shawn, I've just got some copper wire which I will stretch along the attice. Want antenna on inside, easier to do experiments. Nothing that disturbes the field, I hope. How would a Cushcraft R8 vertical multiband antenna be? Advantage: needs little space. Inge ----- Original Message ----- From: "Upton, Shawn" <[log in to unmask]> To: "Inge" <[log in to unmask]>; <[log in to unmask]> Sent: Monday, February 28, 2011 8:55 PM Subject: RE: [TN] NTC: GEC BRT 400S If I'm following the thread correctly, this is a receiver. If so, then just hook up wire--as a receiver it will not care so much about resonance and such. A dipole would work better, but really, a long wire and a good ground--or another wire acting as a ground--should allow reception. If you're not sure if the rig is working, I'd just hook wire up directly to it, get it receiving, then start worrying about better antennas--but quite a bit can be received on a simple few meters of wire. Multi-band dipoles do work, although the 40m antenna should work reasonably well for the 15m element, due to harmonic relationship. I believe 80 and 20 will do likewise. But I have done this sort of thing, but with inverted L's not dipoles. Just make sure to fan the legs out (look up "fan dipole" as this is what you are proposing to build). For straight receive I probably would not use a 1:1 balun, I like choke baluns better for feeding coax, especially for broadband unspecified impedance. Shawn Upton, KB1CKT Test Engineer Allegro MicroSystems, Inc [log in to unmask] 603.626.2429/fax: 603.641.5336 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Sent: Monday, February 28, 2011 2:41 PM To: [log in to unmask] Subject: Re: [TN] NTC: GEC BRT 400S Thanks all for help. I'm making a spider antenna (Rothammel), 6 beams 10 m = 2x2.5 15 m = 2x2.38 20 m = 2x5.05 40 m = 2x10.1 80 m = 2x19.8 m Will rig it in the attic with a 1:1 balun and RG-82 double shield down to the input and north-south direction. A multiband dipol with other words. What do you think? I've no idea about the Q and VSWR, nor Za Inge ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/ContentPage.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------