I will be on VHF/UHF from the Wicklow Mountains on March 30+31 and April 1+2, pointing the Yagi across the Irish Sea. Aiming to be QRV around lunchtime, will decide the day before which SOTA to activate as very WX dependent.
I have enjoyed building the Yagi for my first attempt at 23cm (and 13cm). The boom is 15x15mm and has been reclaimed from a 2m Yagi. There is an extra 15cm behind the reflector so I can mount the antenna before-the-mast for local experiments, for SOTA I use a polyethylene support 15x15cm centrally mounted for balance. The boom is drilled for H or V mounting (M6 bolt and wing nut; for when hands are getting cold and wet on SOTA). The support has 25mm plastic clips to click the antenna onto the fiber mast. For safety I add a quick release tie-wrap as high winds have un-clicked the antenna on occasion!
My first antenna for 23cm was a 10 element Yagi, I have since added an experimental “extension” to make it 21 elements. The two sections strap to my rucksack, they are assembled with an M6 bolt. I used a beacon some 85km away to get a feel of the antenna pattern, turning the Yagi by hand as I would do on SOTA. Last year I managed a QSO Ireland-to-Wales with just the 10 el. Yagi but I am very keen to try the full length version this year.
The folded dipole is made from 3.2mm welding rod, it is very sturdy. The 4:1 impedance transformer is made from 50 Ohm semi-rigid coax, attaching it is quite tricky as the center conductor is very thin. A simple jig made from wood off-cuts is a great help to keep the balun in place whilst soldering!
I’d be happy to supply dimensions and some photo’s of the build please send me a PM (email info on QRZ) or I can publish the dimensions in this thread if you feel that is OK.
Photo below of the 23cm Yagi being tested.