Uplink + Downlink (TX/RX) with Dish
To receive QO-100 you need at least an 85 cm dish and preferably 1 m or more for DATV and on the edge of the footprint. Learn how to aim your dish at the Es'hail-2 satellite on DishPointer. First select "25.9E ES" on the right and then "Your location". Then draw the direction line exactly to your location. Here you will also find the skew angle for adjusting your LNB. Now you should be able to easily align your dish and receive the first PSK beacon signals. You can now make fine adjustments using the beacon signal (Audio sample).
For the uplink, choose a patch antenna or a helix (LHCP) as the feeder. Kurt, DJ0ABR, wrote an article about building a helix feeder yourself. And here you will find an article by Matthias, DD1US, about his construction with dual band feed and LNB.
Uplink with other antennas
A right-hand circular (RHCP) helix antenna can also be used via the NB transponder. Or you can choose a 2.4 GHz WiFi antenna. It should be noted that with linear polarization there is a loss of 3 dB compared to right-hand circular polarization. The transmission power used must also be observed so that no damage occurs.