Alfa WISP-NSR 802.11n Outdoor Wi-Fi Long Range AP/WISP

Not sure you can.
iPad is on iOS and I am not sure they have the proper drivers for the chipset
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What is the device type your attempting to connect to this wifi router? If by chance a laptop computer are you able to plug a Ethernet cable into the device and into port 1 on the router and access the default start up page. Most routers will use 192.168.1.1 as the default out of the box IP address. If so you can start the configuration of the wifi there and make sure the radio is enabled and set the SSID and passwords. Write them down. Some older laptops, and iPads for instance may not pick up 5ghz wireless signals so you need to enable 2.5 ghz.

Hello,
First of all, please let us know on which OS you are (Win. I suppose)
Second, we are going to try to remove possible issues one by one. I apologize in advance for what could seem a stupid question, but I have seen really really really bad things ...
Lastly, it's highly improbable that the card is slowly dying. It's either working or not.

1) OS ? and version.
1.1) Version of your driver
1.2) double check that you have the correct chipset. Copies and knock off of the Alfa cards are rampants on e-Bay
2) How low is your signal?
3) Are you on a 2.4 or 5 ghz signal (b/g/n?)
4) have you tried to remove the antenna and see if you still get a signal?
4) have you tried with a different antenna?
5) have you tried to change the USB?

drivers update. or press the orange light ;)

talk to Dlink directly. (no main router stated, model?)
it is just a RANGE extender,
7 different modes
Access Point,
Wireless Client,
Bridge, Bridge with AP, Repeater, WISP Client Router or WISP Repeater
Compatible with 802.11b and 802.11g Devices(no main told) .
repeater mode (1 of 7) is covered in the manual
and wirlessly bridges to the main AP, and extends the range of the wifi to the new zone,(goal?)
( do this here but use Ethernet from main to new AP) vastly better.
page 26 in your manual covers setup for Repeater mode.
did you do that?
step one is the SSID, use a new name here, not same as other AP or other wireless nodes, ok?
step 2, select repeater
I never use WPS so I skip this (its insecure)
pick manual
page 29 find our main router, SSID name, or survey it.
this is very important to marry the new AP to the old router SSID.
my main would be WPA2, id not use any others (security)
then type in the mains , Password, 8 to 32 chars.
its done.

update the firmware in both routers first? be wise that.
I never do this ,all it does is slow down wifi in 2nd zone.
for sure walls present ! in the line of site paths.
I bridge them with ethernet (wired) now both zone go full speed.

First of all your mobile should have Wi-Fi and support the encryption/security of your Wi-Fi access point.

If your Wi-Fi AP using WEP or WPA most of the Wi-Fi enabled handphones support it and the setup is quite straight forward.

I am giving generic guidelines as the model of your phone is not known.

Just do a wi-fi scan and create the new AP. When asked for the security select the appropriate (e.g. WEP or WAP) encryption and enter the key.

Close the app and start using it.

Wi-Fi settings determine whether iPhone uses local Wi-Fi networks to connect to the Internet.
Turn Wi-Fi on: Choose Wi-Fi and turn Wi-Fi on.
Join a Wi-Fi network: Choose Wi-Fi, wait a moment as iPhone detects networks in range, then select a network. If necessary, enter a password and tap Join (networks that require a password appear with a lock icon).
Once you join a Wi-Fi network manually, iPhone automatically joins it whenever the network is in range. If more than one previously used network is in range, iPhone joins the one last used. When iPhone is joined to a Wi-Fi network, the Wi-Fi icon in the status bar at the top of the screen shows signal strength. The more bars you see, the stronger the signal. Set iPhone to ask if you want to join a new network: Choose Wi-Fi and turn "Ask to Join Networks" on or off. Join a closed Wi-Fi network: To join a Wi-Fi network that isn't shown in the list of scanned networks, choose Wi-Fi > Other, then enter the network name. If the network requires a password, tap Security, tap the type of security the network uses, and enter the password. You must already know the network name, password, and security type to connect to a closed network. Some Wi-Fi networks may require you to enter or adjust additional settings, such as a client ID or static IP address. You can type it manually by login onto the Belkin's network page using the browser and by copying the static and dynamic IP address.

u should buy a business class wireless router ie netgear perhaps