What next - 136kHz WSPR?

Having now almost achieved more than I could ever have expected on 500kHz WSPR with uWs ERP, I'm wondering if I should give 136kHz a try with the same antenna and transverter. If I could maintain the same antenna current (20mA measured) my ERP would be around 3-5uW on 136kHz. I'm wondering how far that might get. Almost certainly not too far, but probably enough to be detected by some of the nearer stations