[TowerTalk] Dipole Problem

[K6TFZ at aol.com]

I always thought a dipole was simple. First the description:

75 meter dipole (58.5 feet per leg) placed 4 feet above peak of second story 
roof. Roof is 40 feet wide so ran extra wire at right angle outward toward 
rest of house (big square "U").
Center of dipole is in center of 40 foot section using a large egg insulator 
and an SO-239
to start, balun later.

My AEA-HF and Autek RF-1 both read resonance at 3968 KHz which is fine BUT
SWR is about 2.3:1, R=29 ohms.

The only thing I can figure is the way I wrapped the wire on the egg 
insulator: so that if
the insulator were to break, the wires would catch each other and not part.

Could there be that much capacitance there to throw my reading off that much?
The wires are at right angles to each other. Any other suggestions?

TIA.  Geoff, K6TFZ