get swr value

how can i get swr value on routerOS (rb411\433 with rOS 4.16)?
there is any command like “t s 14” of dlink(bluebox)?

sorry for my bad english.
i have big mistake in thread http://forum.mikrotik.com/t/connection-between-antena-and-ap/48109/1
of course i mean MT’s analog of dlink’s command