Jim, Have been reading the mail with much interest on your 160 M antenna question, and there are a lot of very good answers. For what it is worth, and just for information, I will pass on my experience with the 160M antenna here.
I had the same problem of space, as well as inability to install a suitable ground system for a vertical, and was advised to put up a 200 ft dipole, fed with open wire and tuned with one of the widely available transmatches. Works out to a 3/8 WL on 160. I found, using an MFJ high-pass T-match, that it tuned up just fine, and I have no problem with making area contacts. The antenna tunes the other bands as well, BTW, and I use it on 80 and 40 also. I used an MFJ antenna analyzer to run through the bands and get the settings. Mine is up about 35-40 ft. The ground slopes, and the thing goes up and down with ice loading and wind in the trees, and I'm not sure how high it is on a given day...but it works. Good luck, and tell us what you did and how it works out. 73, Bill w2dgb ----- Original Message ----- From: Jim Miller WB5OXQ in Waco To: Discussion of AM Radio in the Amateur Service Sent: Sunday, January 11, 2009 11:28 PM Subject: [AMRadio] 160 meter antenna I always wanted to try am on 160 but like most do not have enough room for a full size antenna, so, I am considering building a 160 meter antenna at our clubhouse because there is a 80' tower there and over an acre of land to spread out a 1/2 wave dipole. Question is; 1 Is a 1/2 wave wire dipole the best antenna for the band considering there is room for it. 2 Is 80' high enough for the center of the inverted V? 3 How high do the ends need to be off of the ground? 4 Should I feed it with coax or ladder line to the 10' level (or other) then a balun to coax to the tuner (coax is the only acceptable line into the shack)? The shack is a metal building 30X60' and directly below the tower. There is no way to get ladder line to the operating position since all cables have to run through a 3" conduit for at least 30'. The tower is a free standing commercial tower made of 4 20' sections bolted together with a 2 meter and a 440mhz antenna at the top, all ham antennas. Thanks for any advice. Jim wb5oxq ------------------------------------------------------------------------------ ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.10.6/1887 - Release Date: 1/11/2009 5:57 PM
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