AirPort Express and Extreme Wi-Fi strength comparison I'm about to buy an AirPort model but I'm not sure if there is any difference in terms of signal strength and range. There have been comparisons between these two models in the past but I don't think there are any up to date comparisons. 

As I'm not going to use the "extra" features, the only thing that matters to me is the range / signal strength of the n signal. (As I don't have any devices supporting the ac signal). Shouldn't there be a significant difference between the two models because of the "more advanced" design of the AirPort Extreme? Like the antennas being placed better or something like that? Thanks!
Alright, this is an easy catch here.

If you compare AirPort Express which has 2 built-in antennas , the AirPort Extreme has 6 built-in antennas. You should be able to do the math here and jump to the conclusion that the Extreme would have a better range and signal because of this fact.

To see the source, please click the back url below the Airport Extreme picture here.

Please check this comparison model provided by Apple.
The difference for you 


Express max 300Mbps
Extreme max 1.3Gbps