The easiest way (and this is how I have my DirecTV HR21 feeding two HDTVs) is to use component video from the box to TV1 and HDMI to TV2...a distance of 40' should not be a problem for HDMI.
The coaxial cable you have in place won't be of much use to you unless TV2 was an older SD set. In that case you'd connect the red & white analog audio and yellow composite video outputs of your DirecTV receiver to the inputs of an RF modulator and connect the coax to the output....I have mine hooked up this way as well feeding an old CRT in the bedroom.
The coaxial cable you have in place won't be of much use to you unless TV2 was an older SD set. In that case you'd connect the red & white analog audio and yellow composite video outputs of your DirecTV receiver to the inputs of an RF modulator and connect the coax to the output....I have mine hooked up this way as well feeding an old CRT in the bedroom.