My wife and I are building a getaway house up North to get away from the AZ summer heat. I put up a Buckmaster OCF that I bought at a hamfest for $10 (sure glad I didn't pay the new price). It sort-of works, but I am looking for something better. I will explain the "sort-of"... Here is a picture of the existing installation, looking West. The line to the right (North) is just a guy rope. The long leg of the OCF from ESE is in the foreground; the short leg runs WSW. The apex is 39ft agl. The angle of the support ropes puts the short end about 20ft agl and the long end about 15ft agl. The vertical support is a light-duty TV antenna tower about 25ft tall, with an aluminum "painters-pole" at the top, for a total height of 39ft. The pole requires guying, so the OCF is a bit out of plane and pulls the tip of the pole to the South which is offset by the single rope guy pulling North. Now for the "sort-of" comment: I first put it up by connecting the 100ft RG8 feedline directly to the Buckmaster OCF transformer. The SWR on various HF bands looked good (on my RigExpert AA-600). Transmitting at 100W works ok, but when I used ~800W, all hell broke loose. First, I tripped 4 of the fifteen AFCI breakers in the house main electrical panel (including the one powering the 100W rig). I also set off the wired smoke alarms in the house. The manufactured house is new, build to latest electrical codes which require that most of the breakers be AFCIs. Code also requires cross-wired smoke alarms. It occurred to me that the OCF has lots of common-mode current on the feedline, which brings the RF into the house, so I put a 100bead common mode choke right below the OCF transformer. First I re-measured the SWR. I was a bit surprised to find that the SWR on all bands, and especially on 3700 MHz, got a lot worse, so much so that I now had to use an antenna tuner on 75m and 40m. 20m and 17m would still work without a tuner, but the SWR increased there, too. With the CM choke in the feedline, at 800W I wasn't tripping the AFCIs, but it still caused the smoke alarm closest to the end of the house where the tower is to go off, which I can live with by removing that one alarm (there are still four others active in the house). However, this does not put the Buckmaster OCF in a good light. The #$%$#$ thing relies on the feedline radiation (aka common-mode current on the feedline) to achieve an acceptable SWR on 75 and 40m. Blocking that by putting a good CM choke right below its transformer radically changes the feed point impedance, and a tuner is required. So, to improve my system, I want to get rid of the OCF and its common-mode current problems and replace it with symmetric wire antennas. Here are the requirements: 1. Cover 75m, 40m, 20m and possibly 17m. 2. Retain the existing 39ft center-support. 3. The antenna wires should act as guys for the vertical pole (ie. run in either three or four directions) 4. Coax feed, no tuner required on 40, 20, and 17m. Tuner ok on 75m. 5. The 40m antenna should have best radiation due South; dont care about the other bands. 6. Minimize common-mode current on the feedline, by antenna symmetry and CM choke. I'm thinking two inverted-Vs, about 90degrees apart, sharing one feedline and CM choke, one for 40m (my primary band), and the other for 75m/20m with 20m parallel-tuned traps. Any other suggestions?