I need to correct myself again.

Based on the Tacit Blue chart the delta between VHF and X-Band is not 2.5 times but 2.5 DBSM. If we take the golf ball value of 0.0014m² which translates to 28.5 DBSM at 2.5 less DBSM, 26 DBSM we would have a 0.0025m² target in VHF band. Less than half of my false number in the previous post.