Hi Larry -
I picked up a bridge from the eBay link above.
The build quality is poor and the 2, 100 ohm resistor pairs are each not in parallel.
So even though the board is green,
it's no better than one of those blue boards with the same issues.
Sorry to learn that; I suppose only ones from Ukraine are better.
At least it's fixable.
Leaving 100 Ohm resistors NOT connected in parallel improves sensitivity for differences at higher impedances,
but fixing coax terminations thru ferrite beads is necessary.
Oristo