Aerials have a fairly low dip in their impedance curve, so 4 ohms is probably correct. However, you ought to try both taps and use the pair that sounds best to you.
I've been told by "Chris" at ARC that the 8 ohm taps sound better on ARC VT amps. If you are concerned about the speaker impedance being too low, try raising it by using the Paul Speltz Zero auto-former.
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