Removing the reflector on a DB4e will make the antenna strictly bi-drectional. It will receive equally in both directions on UHF. I often recommend this step when I feel it's a useful step to take.
If you can currently aim the antenna in the correct direction for the TV station of interest and its reception is reliable, then a bi-directional antenna MAY work okay. TANSTAAFL, after all. However, if the antenna is already aimed in the direction of the station and reception is not reliable, making the antenna bi-directional is most likely adversely affect reception.
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