Here is my dipole for 40m band. It is a simple linear loaded dipole feeded with 450-Ohm openwire feedline.
I designed it for resonance at 7.050 MHz, but using my LDG AT 100-PRO-II tuner I can tune it also on 30m and 80m bands. The latter with poor results.
I use to simulate all my antennas with MMANA-GAL. Here you can see dimensions of the dipole and simulation results.
As you can see, elevation and SWR curve are very good.
To build it I used simple electrical copper wire (2.5 mmq/13 awg) and two fishing poles with size of about 7 m/23 ft.
Linear loaded lines ar 3.5 m/11,5 ft long. You can find all sizes in the following file. (Rename it in .mma after downloading)
Here you can see it on top of my (homebrew) OB9-5 clone. Really not bad.
And here is the on-field Z measurement using my RigExpert AA-54. Really not bad on the whole 40m band!