Hello,
I recently constructed an antenna similar to this one:
http://www.hamuniverse.com/multidipole.html
There was no mention of a balun at the feed point, however I do now notice that they indicate separating the shielding and connecting each dipole at a different point along the length of several inches of unshielded cable.
In my attempts to make things "cleaner" I didn't cut up a piece of coax, but I did use a pl239 connector where all the dipoles meet. The attached images show the feed point inside the junction box and the finished antenna mounted on the roof. Note the roof is about four stories up, however at the end point (lowest part) of the 40m dipole is maybe a foot off the roof.
Some comments have been made that I should have fed the dipole using a 1:1 balun for various reasons, one of which to avoid arcing between the dipoles.
Any considerations I should really take into account for this antenna design? Modifications?
Thanks.