[TowerTalk] question about constructing a doublet

[k2vi]

Im building a doublet for primarily 75 and 40 meter phone. It is being fed with 450K # 14 stranded ladder line, the good stuff. Im confused on the lengths. The run of ladder line will be around 45 feet directly to the atr-30 tuner. no EXTERNAL BALUN. Also the length of the antenna im thinking 65 feet per leg but that falls on 3.6 mhz but makes it a full wave at 7.2 dead smack in the 40 phone band. What should i do cut the antenna for the center of the phone band on 80 or keep it at 65' per leg. If anyone has an idea what length of feed and antenna would make a perfect load for both bands would be greatly appreciated. thanks guys.

tony k2vi