Is that the Israeli plane?
Yes, it is. I think its a very nice looking plane. Kinda looks like they used the Aero Commander as a base.
Yes it was first a Jet Commander then Westwind 1 then Westwind II
then the next spinoff was the Astra then Gulfstream G100 and G150.
If you put a Jet Commander, WW 1, WW II, Astra, G100, G150, all side by side all five have the same tail and all five have the same basic fuselage.
I work at an FBO at KGTU Gorgetown Texas and the Pilot of a Gulfstream G150 told me the story because my boss has a Westwind II and they were sitting side by side out on our ramp and I said something about the tails looking alike and thats how I found out the whole story.
Here are some pic links

Jet-Commander
http://www.airliners.net/photo/Aero-Com ... 1415138/L/Westwind 1
http://www.airliners.net/photo/Israel-I ... 1429431/L/Westwind II
http://www.airliners.net/photo/Israel-I ... 1447250/L/Astra
http://www.airliners.net/photo/Israel-I ... 1452323/L/Gulfstream G100
http://cdn-[url=www.airliners.net/photo/Gulfstream-Aerospace-G100/1302984/L/
Gulfstream G150
http://cdn-[url=www.airliners.net/photo/Aerocardal/Gulfstream-Aerospace-G150/1457004/L/
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