I agree with the previous posters, get Blue Jean Cables
Sometimes there are diffenrt gauge wire, even in the HDMI. If you can get a larger wire cable ( lower number) get the large wire size. At 40 feet, the resistance of lower gauge HDMI wires begins to add a resistance (impedance with V/I phase shift) to the circuit.
In otherwords for that distance it is better to use the 22 gauge as opposed to the 28 gauge wire.
recommended cable = Tartan Cable 22 AWG HDMI Cables:
(Chinese-made, 22 AWG Tinned Copper, rather thick and inflexible)
Note: we carry these in HDMI/HDMI only; no HDMI/DVI.
HDMI Cable, Tartan 22 AWG, 30 foot, Black (or white) @ $45.00
see URL :
http://www.bluejeanscable.com/store/hdmi-cables/index.htm