wifi router

[Woof]

if you have multi-storey structure and wish to extend wifi signal up to the upper floor you'll need not just use a higher gain antenna, but an AP with WDS (bridging capability)

most modem-routers from the service provider have internal antennas which broadast relatively weaker wifi signal. initially to boost the signal attach an AP with an external antenna to the ethernet port of service provider modem-router.

the signal from the AP can be further extended with another AP with bridging or WDS function

bridging works like a chain, each AP attached to the network links to the nearest AP to have a strong signal in every floor. when the link in between fails, the link further away from the root router lose internet connection

for a 3 storey with roof-deck set-up where the root router is located on the 3rd floor. i linked the 2nd floor to the 3rd floor then i linked the roof-deck to the 3rd floor

if the root router is located on the ground floor, ill link the 2nd floor AP to the root router, then the 3rd floor AP will be linked to the 2nd floor AP, then the roof-deck AP will be linked to the 3rd flr AP

ill always pick a bigger antenna device for high gain for a strong radio signal beause radio fade is the biggest drawback of a pure wireless network set-up

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That works but with each jump, you lose half the bandwidth so I wouldn't be surprised if the last link on your uppermost floor performs poorly. I only use WDS or repeaters at the ends of a network and never in between as a link to more nodes. For your setup just use powerline networking to leverage your home's wiring. It's cheaper and more reliable than wireless bridging. Less latency too!