this really depends on what kind of guide camera you are using, and what it's bandwidth requirements are. If you are fetching 1 frame a second with a small frame, it wont make a huge difference. OTOH, if you are trying to use a 30fps video stream, that's going to suck down a ton of bandwidth, and likely get rather far behind on a slow wifi connection.
It also makes a huge difference what kind of wifi connection it is. An older g mode 2.4ghz radio runs at a maximum on air rate of 54mbit, which will result in 27mbit thruput under ideal conditions. OTOH, if it's a 5ghz AC unit, it can have on air rates well over a gigabit, and result in 800mbit overall system thruput under ideal conditions. Not all wifi is created equally. N mode on 2.4ghz advertises 300mbit, most are only capable of 150, and can only sustain on the order of 70mbit under ideal conditions.
The other issue is your conditions for wifi. on 2.4 ghz your thruput will cut in half for every 75 to 100 feet of separation between them, and it cuts in half for each and every wall between them. At 100 foot distance with two walls in the way, you will be lucky to keep 10mbit sustained. 5ghz is much worse, thruput cuts in half for every 50 feet of separation, and by a factor of 4 when it goes thru the first wall, it rarely manages to make it thru a second wall.
And these numbers dont account for any band congestion. If you are in an area with lots of other wifi access points, or security cameras running on those bands, the numbers can easily fall off by a factor of 10.
This is a subject I deal with every day, the network I manage has over 5000 access points in 1000 edge node locations, so we see it all. This is why even tho we are in a fairly clean wifi environment here at our farm, we still see plenty of contention from neighbors access points and security cameras, so I ran conduits with optical fiber between the house and the dome.
Oh, and one more detail I forgot to mention, what kind of antennas on your wifi gadget make a huge difference. As an example, the rpi3 on board stuff is a horribly poor performer, dont even consider that one for any real distance at all. It works ok for a connection 'in the same room', but, put 100 feet of distance between it and the access point (or other device for ad-hoc) and the signals will be barely measurable. moreso if the other gadget is another one with equally poor antennas.