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Adding antenna for receive, or splitting the signals for use with an SDR is covered very well this site from N1FD: https://www.n1fd.org/2018/10/10/add-sdr/
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The radio and electronics blog of Carl Ratcliffe, M0ICR
Adding antenna for receive, or splitting the signals for use with an SDR is covered very well this site from N1FD: https://www.n1fd.org/2018/10/10/add-sdr/