PCIe Wireless Adapter Slowness

I have a Netgear N300 WiFi Range Extender whose Ethernet port I use to connect my desktop to my network.
I want to use the extender for other things so I bought a D-Link Wireless N300 PCI Express Desktop Adapter for the desktop.

However, I am getting way lower speeds with the adapter (5-10 Mbps) than I was with the extender (30-35 Mbps).
Even connecting to the extender's wireless network with the adapter yields higher speeds (20-25 Mbps).
I have found that repositioning the adapter's antennas increases speed but only to an extent.
Is the wireless adapter really that inferior to the extender?

Is there anything I can do to remedy this? Or should I just return the adapter and buy a second extender.
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Reviews on that adapter indicate it works best in G mode, and N mode isn't so great:

What's the signal strength? Sometimes the position of where the PC is can affect it, because the adapter/antenna are say, near the floor back up against a wall. It's also possible a different adapter may work better

I've used this TP-Link Nano Router in Client mode to attach a Ethernet-only device to my wifi recently:

It might be a cheaper alternative to getting another one of those extenders.

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Randy DownsOWNERCommented:
If you like the extender that much better then purchasing another may be the best solution. Here's an article that may help.

new wireless router or Powerline Adapter set with built-in wireless are best but can cost more than a simple Wi-Fi Extender. The best Powerlines, with wireless functionality, we tested cost from around £50 to £150. Wi-Fi extenders such as TP-Link’s TL-WA860RE or AC750 are priced around £35. Read: TP-Link Wireless Extender review.
Wi-Fi extenders catch a wireless signal and then rebroadcast it, helping to strengthen the signal from a router on a different floor of a house or on the opposite side of a building. It should be noted that they can also drag down your network's performance.
A repeater uses half its internal antennae to receive a wireless signal and the other half to transmit a new signal – effectively halving the potential speed of the device’s network connection.
This shouldn’t be that noticeable for light web browsing, email, etc, but can be felt when streaming video or moving files around the network. That’s why we prefer Powerline for the more demanding tasks.
Wi-Fi extenders share the bandwidth with the router. Wi-Fi speeds are slower because it’s sharing the data between the router and the extender, whereas the Powerline simply acts as a single device (not sharing the bandwidth) and so you get stronger signals.
The slower is not MIMO, see wifi alliance certifications for Ralink 29xx and Atheros 98xx
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bejhanAuthor Commented:
What's the signal strength? Sometimes the position of where the PC is can affect it, because the adapter/antenna are say, near the floor back up against a wall. It's also possible a different adapter may work better
I played around with the location of the tower and was able to match the speed of the extender. I guess the antennas being between a wall and the tower was causing the speed reduction. Boosted my signal from 50% to 80% just by turning the tower around.
The limit is 150Mbps as new wifi card is not MIMO.
Thanks for the points! Hopefully you're happy with the position of your tower, but an alternative would be to stick an antenna with a cord onto the card so you can set the antenna either on top of the tower, or a desk or something. Something like this one:
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