Male SMA Plug for EF-MTR Antenna. This is a replacement or spare for the EF-MTR. Per our manual, this EndFedz is a little different than OUR previous designs in that it requires the user to remove an SMA connector at the end of the 30M resonator to enable just 30M, or keep the SMA installed for 40 and 20M. Because of the broad bandwidth of the antenna, it is unlikely that it will require tuning in the vast majority of deployments. This is particularly true of 30M where the band is very narrow. Once 30M acceptable VSWR is observed (typically below 1.5:1 with the SMA connector unscrewed/ removed as in Fig. 3), move on to checking 40 and 20M.