I have an EFHW 40-10 in inverted L configuration on a fiberglass mast. I'd like to put an aluminum push-up mast nearby for a 6 meter antenna.
How close can I get to the EFHW with the push-up mast?
The ~67 ft. EFHW extends from 3 feet up to 46 feet on the fiberglass mast, and then over to another mast for the horizontal section. The most convenient location for the aluminum mast is 6 feet away from the fiberglass mast, on a right angle to the horizontal portion of the EFHW (think "L", where the horizontal portion of the EFHW extends due north). The aluminum mast extends fully to between 20 and 25 feet.
Update: Took SWR readings after work. Green is without the mast, orange with the mast.
Another update: Moved the mast 12 feet away, this time due south instead of east.