WSPR with ZetaSDR

For more than month I am running RX WSPR with my ZetaSDR receiver, http://www.qrz.lt/ly1gp/SDR/ and Rocky software on 80 m. Despite the "antenna" which is just ~17m of wire in building closed environment and industrial site, results are quite good. When conditions are better WSPR stations of Uk and around are received even in daytime. Planning to run test on fullsize 80 m antenna. The only problem is that frequency of received station is displayed incorrectly by several Hz, because Rocky can not change freq in Hz. Will see a solution for that.