Unfortuntly the bigger and better the antenna, the more directional it becomes and there will be little or no reception from the rear.
The best reception for your Dad would be to use the HD7084 antenna in a rotor.
I get some 'push back' when recommending a rotor, but the truth is "directional antennas are intended to perform there best whem aimed toward the transmitter".
Anyone who wants to know if a rotor is needed in there area should look up when driving around. If nearly every antenna has a rotor one should be considered.
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