Skybox, signal worse since adding hdmi splitter

[CraigVmax]

I have an Amstrad sky hd box, I've always outputted from it direct to the room it's in via hdmi but also gone out from its rf, into my wall co ax socket which sends my terrestrial aerial signal through the rest of the house. Both with a great picture.

I just plugged an hdmi splitter into the skybox so I can also send an hd feed to my kitchen. This worked fine but I've noticed that the terrestrial signal in the rest of the house is worse. Any help appreciated.

[CraigVmax]

I'd thought I did but I'll recheck thx v much

[andy.blue.mini]

If you remove the HDMI splitter doers the signal improve?

[CraigVmax]

didnt seem to, Ive since rechecked all the coax connections and that seems to have helped although I do now have screen blindness where i cant tell if anything looks good or not because Ive looked at it too much.