i have an nmo mount antenna on my truck. it was a uhf p.s. 1/4 wave. i replaced it with an antenna that was originally an 84" whip..( have no idea what it was). i cut it down to the 1/2 wave length of 38 1/2" for 146mhz. will this do some good for my vx-150, or do i need to go 1/4 wave?