A little late to the discussion but when I visited the park in January 2018 I saw the following antelope species:
1) Springbok
2) Blackbuck
3) Nilgai
4) Black Duiker
5) Yellow-Backed Duiker
6) White-Bearded Wildebeest
7) Bontebok
8) Nubian Red-Fronted Gazelle
9) Thomson's Gazelle
10) Slender-Horned Gazelle
11) Roan Antelope
12) Sable Antelope
13) Ellipsen Waterbuck
14) Lake Victoria Waterbuck
15) Ugandan Kob
16) Red Lechwe
17) Nile Lechwe
18) Southern Gerenuk
19) Cavendish's Dik-Dik
20) Addra Gazelle
21) Grant's Gazelle
22) Fringe-Eared Oryx
23) Scimitar-Horned Oryx
24) Gemsbok
25) Arabian Oryx
26) Cape Steenbok
27) Lowland Nyala
28) Giant Eland
29) Eastern Bongo
30) Common Eland
31) Eastern Sitatunga
32) Southern Greater Kudu
~Thylo