Repeater actually cuts the Bandwidth by half. (Since it has to Flip-Flop between Transmit, and Receive with a single Radio).
However if used correctly it increase the Distance.
The following is for illustration purpose, actual numbers in your settings could be totally different than the following.
Let say you get 1Mb/sec. (1Mb/sec. is probably the limit for Internet surfing) at 80'.
Assuming that the bandwidth at 60' is 2Mb/sec. You put a Repeater at 60', it cuts the bandwidth but it will transmit for another 60-80' so all together you will get the 1Mb/sec. at about 150'.