Display NYSE AD index using IB data feed

Hello,

I'm looking for a ways to plot the NYSE AD line on AB, using IB as a data feed. I've read the discussion, here and elsewhere about how useless the IB data feed is for the NYSE-TICK index. Does this also apply to the NYSE-AD index?

I've been trying to plot it, using the information here and here, but this doesn't work.
Strangely, trying to display the chart for the corresponding ticker on TWS, AD-NYSE, also doesn't work.

Many thanks,
Paul