I have an ADSL Internet service, the desktop PC is connected to the router via a wired connection and the notebook/laptop picks the wireless signal from the antenna.
The router is a TP-LINK TL-WR741N.
The problems started a couple of days ago, it takes a long time for the laptop to connect (around 1 minute against 5 secs); and once connected (not always connects) it's very slow, most of the sites throw the timeout message.
Inspecting other signals, sometimes there are 5 more networks detected, but all with low signal level, my network is detected with 100% of strength.
Both computers run on Linux Ubuntu O.S.; by running the
sudo iwconfig eth1
command, I get these values:
Signal level is -35 dBm and noise level is -78 dBm
Link quality 555
Tx-power 24 dBm
(both signal level and noise level are an average)
The router is set to the highest transmitting power.
Of course I have no problems with the wired connection.
Looking for details about this router I found this:
The router comes with a 5dBi Fixed Omni Directional Antenna.
and in Wireless Transmit Power it says
20dBm(MAX)(EIRP-total effective radiated power is 20
dBm(100mW), antenna gain will not influence wireless
transmit power)
So it will not make any sense changing the antenna?
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Will a higher gain antena fix my problem? 
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