slimline dish is pretty useless for fta - the freqs are different than what most FTA uses and the polarity stuff is different, too. DIRECTV also doesn't use DVB-S, so you can't hook up a common FTA receiver to see if anything would be free.
you could point it to a DISH Network slot and watch the 4-5 promo channels or temporarily FTA services there.
Although it may work with the right LNB on some satellites but you would have to do some modifications just do this......
Forget about the Slimline Dish. Workable size starts at 76cm like the winguard, best to use would be a
80 CM or 90 CM dish is ideal for FTA. Head to one of our Gold Sponsors above for complete information. You will need a linear LNB also. If your wanting to get more than one satellite, (The Best Way To Go!) go motorized so you can get the entire Clarke Belt!
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If the slimline is already mounted and pointed, just leave it and put up a 36" FTA dish. Later you can add the slimline via a DiSEQc switch and with 22Khz enabled you can get NASA off 119° from the slimline as it sits, pointed for DirecTV. While it is a waste to have a slimline pointed at NASA, unless you can sell it, it is easier to just leave it alone.
Of course if you need that location / pole to mount your 36" dish, that is different.