I did something similar, though only 25 feet. Rather than buy an HDMI splitter and worry about HDCP etc. I used a Component to HDMI converter.
Satellite box connects to main TV via HDMI, then a really thin Monoprice HDMI cable from the converter along the baseboard around the corner and into the wall, up the wall to the wall mounted TV. Works well. The only minor drawback if both TVs are on is the audio delay as one has an extra conversion "hop"
Panasonic TH46PZ80 , Samsung PN50B850