I played a bit with a Dish500 dish that came with my house, and while you won't be able to get any of the networks, you should be able to get a few other things.
Based on my experience, you should be able to get:
- NHK World, RT, CGTN News on 103W (Respectively Japanese, Russian and Chinese "news", in English)
- CGTN on 95W (in Chinese, English, French and Spanish) plus a couple of other Chinese channels
- ABC News feeds on 91W
- Probably KBS America on 123W (Korean TV, often with English subtitles)
- Maybe PBS national feeds on 125W - but I have not tried that one with the Dish 500
- Most channels on 97W but on some of them you might have a bit of difficulties with interference from 95W
- If in the Eastern part of the US you might be able to get Hispasat @30W, with some channels from Cuba, Spain and the Middle East
In my opinion, for what it's worth, NHK is quite interesting, and very high quality, and CGTN is good too, especially their documentary channel on 95W. KBS can be quite entertaining. 97W has many religious channels and many foreign-language channels.
Note that there won't be much of a margin for signal degradation from rain, so all listed above are likely to vanish whenever there's heavy rain (with 103W and 95W probably the most resilient)
So, it's up to you to decide if it's worth investing in a receiver and a new LNBF. Like Titanium said, a 36" dish would get you more channels (NBC feeds on 103W, Louisiana PBS on 87W, PBS on 125W) and reliable reception. But obviously, a 36"dish is a lot larger than a Dish 500, and a bit more difficult to aim properly.