Hallo Ed
In the Reflector you will find many practical examples of endfeds.
Stephan @HB9EAJ has written an excellent report: Portable 7-Band EFHW Antenna
I have great experience with endfed for 40, 20, 15 and 10m … and my Endfed with the Trapps for 60, 30 and 17m runs also quite well: The antenna for the favorite bands - not afraid of traps
The wire for the 60, 30, 17m endfed is a bit longer and you can hang it over the other endfed on the same mast (both as inv. V). Then you only need to reconnect the antenna on the TRX.
73 Armin