[TowerTalk] Help need Vacuum Relay Isolation 1.8 to 30 MHz

[RCARIELLO]

Vacuum relay RF isolation 1.8 to 30 MHz frequency range?
I am planing to construct an antenna switch for a Multi-2 operation. Each
antenna will be shared with two stations. Using two single pole normally
open vacuum relays on series. The center connection going to the antenna.
The open ends of each vacuum relay going to a station.

At the 1500 watt power level will the single open vacuum relay provide
enough isolation?

How much isolation can I expect?

Thanks for your help,
Rich AA2MF