Is antilog just negative log?

?2015-04-12T08:05:48Z

No.
Log 100 = 2
Antilog 100 = 10^100
Antilog 2 = 10^2 = 100

Como2015-04-12T10:45:58Z

No.
The antilog is the number that corresponds to a log.

Example ( for logs to base ten)
Log ______Number
2__________100________10^2 = 100
3__________1000_______10^3 = 1000