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/
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/