David, you're correct about realigning the pattern, or donut as you refer to. However it depends on how you reshape that donut. In some cases, you end up with radiation patterns which look like a silhouette of an open hand. Almost all of Diamond's VHF gain antennas have the issue to some extent. Larsen's NMO2/70 looks fairly good on 2 meters, but does have a minor null on 70 cm (≈.5 dB). While we're speaking of gain, all of the Pacific Rim antenna companies use dBi instead of the more standard, dBd. Unless you know the difference, it appears their antennas are better (gain wise) than the US brands, when the reverse is true.