Morning Coastguard and all, whew, relating to dimensions. Sorry to dissapoint but the short answer is no, i can`t as it`s not that simple as there`s many things to take into consideration - on top of that, it`s at the top of the mast and at my age it`s not so easy to get up there!! Right, what i can tell you follows and remember, it`s only a guide. Not only did i used copper, i had to make up a base for it. I didn`t use magnetic capacative coupling but direct coupling to a ground plane. The feeder is 75Ohm not 50Ohm and of the many types i tried some used copper for the shield and others alloy so there`s a soldering problem. I can witter on for hours about it but the crux of it is that ALL the things mentioned have a direct bearing on it`s performance. Best advice i can give is that make sure the former used for the circular elements is the right diameter when you`re winding them. Take into consideration that the antenna has to be connected to a feeder and the shield. Measure everything twice when you make the copy and EXPERIMENT - it`s the only way. As for the grounplane, i use a one foot diameter teflon coated cooking dish so no corrosion. Remember to scratch away the area where the coax sheld is attached. So, without diagnostic help, a near as dammit copy of the original is just a start but copper wire is cheap enough so give it a go. Regards to all, Roger
PS, The attachement is bit sparse but gives a classic indication of obstructions on the polar diagram. The dip due north is a block of flats 1 mile away. The dip to the NNE is Ferrybridge power station three miles away and the dip to the NE is Eggborough powerstation six miles awy.
