Hi,
What you need is the Omnlink , it has a device to connect to the rf out plus includes a TV Link as well with the pack and various other sensors , please check here: SLx Omnilink Plus TV Link Kit
Note that your DM500 does not have any rf out connection therefore you will also need an RF Modulator , and of course running a coax cable from DM500 to second TV.
Any advice required let me know . Alex
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