IME the dongles can be flaky. Ethernet bridges, OTOH, are more reliable and give you the option of simply plugging in an Ethernet cable in back of the Samsung to provide internet.
Router (Ethernet out) --> (Ethernet in) Wireless bridge -> (Ethernet out) --> (Ethernet in) Samsung HDTV
Example bridge:
http://www.amazon.com/TP-LINK-TL-WR700N-Wireless-Portable-Repeater/dp/B006DEBYWU/ref=sr_1_8?ie=UTF8&qid=1458153770&sr=8-8&keywords=ethernet+bridge
I live in Australia.
I have a LED TV Samsung UA40D6000
I would like to link it to our wireless internet.
What model adapter will I need to buy.
Thankyou
judkam

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