MTH800 antennas are designed to work on 360MHz to 430Mhz how do they perform on 434Mhz?
M0JGX did some tests using a VNA, these were only "quick and dirty" and no way scientific as the connector on MTH antennas isn't standard.
He used a quality Icom 70cm handheld antenna as a control and also tested a couple of 70cm antennas from China. The VSWR on 434.000MHz is as follows.
|Stubby 70cm Antenna with SMA||2.82:1|
|Stock antenna for DMR / FM dual band radio (SMA)||2.12:1|