1.  What sizes did you use for the shorts on each element ???

    The distance to the tapping point or shorts from the centre of the elements are 10M 1570mm, 12M 1800mm, 15M 2100mm, 17M 2300mm & 20M 2720mm

2. Does the element length include the loop back or does this need to be added.

    The length quoted DOES NOT include the loop back and thus this needs to be added to the element length to get the overall length of wire.

3. The length of the elements for 17M quoted in the pdf file seem to be wrong.

    Correct, I found that the length of the 17M elements was given as 4400mm however this is approx 400mm too long. I would suggest starting with an element length of about 4040 + loop back and then trim from here as it's easier to shorten than to add length to the element.

4. I can't read the dimensions on page 25 of the pdf file, what are they ?

    Most of the dimension on this page can be derived from looking at the individual drawings of the components however I found that the important one to know is the distance from the centre of the antenna to the point where the element is attached to the spreader. Again these can be calculated from the parts shown but it takes a bit of time so I have listed them below.

10M 894mm, 12M 1064mm, 15M 1254mm, 17M 1474mm & 20M 1854mm. Once you have these the other main dimensions fall into place.

Overall though don't be too concerned about exact dimensions each antenna built will be slightly different due to the tuning characteristics.