A full 1/4 wave whip for 46MHz would be about 24" shorter than for 33MHz but trimming a loaded antenna may not follow the exact same ratio.
Many loaded low band antennas come with 39" whips and that might leave you with about a 15" long whip after cutting for 46MHz. That's not good, I suggest you find a correct antenna for 46Mhz.
prcguy
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