Im still unclear as to which antenna is which. Is one TX and one RX and or is this MiMo technology/OFDM where both are transmitting and bot receiving using spacial diversity? If thats the case this panel on one antenna is hurting you not helping you. If its strictly one TX and on RX then you could be onto something. But which antenna is which. As the Panel antenna would need to be on the Transmitter of course.