This might be like Mrs. Noah telling Mr. Noah all about the big rainstorm but here goes. Years ago, I tried using a normal, everyday, antenna switch for 2 Meters, 220, and 440. Say what?
Somethings not right. I checked the standing wave ratio without the switch and then checked it with the switch in line. Hmmmmm..... I got a higher SWR and lower power output with the normal switches. Then I went out and bought a high dollar cast Aluminum antenna switch and it worked a lot better. If you are using one of the one's that work great on HF then you might consider getting a switch that is Cast Aluminum and only has the number of outlets that you actually need for VHF and UHF. I attribute the problem to long lead length inside the large HF switches because long lead lengths in a VHF and UHF circuits are a definite NO, NO.