Hi guys had a go at constructing my first 450 ohm ribbon fed doublet. Each leg is around 21.5 mts....one side of it is in clear air...the other half has to pass over my house roof and comes within 1mtr or the roof ridge....the ribbon feeder is 20ft long leading to my upper floor shack. Its also in a Z shape to fit in my lot. Never used ribbon feeder before so I am learning on the job and have a few questions. On hooking up to my analyzer to my balanced line feeder ATU with its 4-1 balun set to by-pass I find none of the lower HF freq have low SWR reading...some readings as follows. 80m 3500khz 7.28-1 149 ohm....3800 khz 9.66-1 367 ohm 40m 7000khz 6.8-1 10 ohm 7200khz 6.43-1 6 ohm 30m 10.000khz 5.04-1 64 ohm 10.200khz 4.27-1 47ohm 20m 14.000khz 9.70-1 116 ohm 14.300khz over 10-1 116 ohm 15m 21.000 3.99-1 7 ohm 21.300khz 3.5-1 7 ohm. Tuning is patchy on 40m...but generally it tunes but could be improved. Anybody give me some idea on how those figs look....as I say my first entry into using ribbon feeder and doublet antennas.