I'm seeing conflicting information. Does this allow me to view tv in HD?

What Angel T. and Miles O said is correct. With the EXTEND model you can receive HD video over an 802.11n (2007) or 802.11ac wireless connection. Your router's user guide or specification sheet should tell you which one it is. Note that as Miles indicated, it depends on what model you buy. The EXTEND model has a 'transcoder' that reduces the amount of bandwidth needed to distribute the video over your wireless network. As always, your wireless signal should be good. If it's not, you may experience quality issues. See the product description for more information; https://www.silicondust.com/product/hdhomerun-extend/

What is new in this 4th generation unit? I'm especially interested in knowing if the tuner is now more sensitive.

I have to wonder if the old blue single unit is more sensitive. I wonder if having one antenna for 2 pictures involves a splitter than reduces each RF input by half. You could probably get an old blue unit cheap on Ebay & compare its performance.

How much hard drive space per hour of HD video does this require?

That depends on the movies, your cable provider, and the kind and amount of compression they use in delivering the movie to you. In my implementation I was able to store about 260 HD movies on a 2TB hard drive.

does this work with linux

From the Amazon description:Windows Media Center on Windows7/8, MythTV 0.25 or later - DVR for Linux/Mac (copy freely channels only), NextPVR - DVR for Windows (copyfreely channels only), MediaPortal -DVR for Windows (copy freely channels only), JRiver Media Center - DVR for Windows(copy freely channels only), InstaTV Pro - direct streaming on iOS and Android devices + transcoding on a Windows PC (copy freely channels only), HomeRunTV app- direct streaming on Android (copy freely SD channels only), DLNA-compatible smart TVs and media players.

ASIN	B00GY0UB54
Antenna	Television
AntennaDescription	Television
Best Sellers Rank	#138 in External TV Tuners
Brand	SiliconDust
Color	Grey
Compatible Devices	Computers, Smart TVs, games consoles, Blu-ray players, Tablets, Smartphones
Connectivity Technology	No Wi-Fi
Connector Type	RJ45
Customer Reviews	4.1 out of 5 stars 731 Reviews
Global Trade Identification Number	00857799005002
Includes Remote	No
Item Height	4 inches
Item Weight	1 Pounds
Manufacturer	SiliconDust USA, Inc
Tuner Type	Digital
UPC	094922394576 857799005002
Warranty Description	2 years warranty

SiliconDust HDHomeRun Connect. Free Broadcast HDTV (2-Tuner)

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