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One example of omnidirectional antennas is the very common vertical antenna or whip antenna consisting of a metal rod (often, but not always, a quarter of a wavelength long). A dipole antenna is similar but consists of two such conductors extending in opposite directions, with a total length that is often, but not always, a half of a wavelength long. Dipoles are typically oriented horizontally in which case they are weakly directional: signals are reasonably well radiated toward or received from all directions with the exception of the direction along the conductor itself; this region is called the antenna blind cone or null.

What is meant by the area where signals cannot be accepted well along the conductor?
Answer: null
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However, from 1971 to 1975, NBA teams played preseason exhibitions against American Basketball Association teams. In the early days of the NBA, league clubs sometimes challenged the legendary barnstorming Harlem Globetrotters, with mixed success. The NBA has played preseason games in Europe and Asia. In the 2006 and 2007 seasons, the NBA and the primary European club competition, the Euroleague, conducted a preseason tournament featuring two NBA teams and the finalists from that year's Euroleague.[citation needed] In the 1998-99 and 2011-12 seasons, teams were limited to only two preseason games due to lockouts.

When did the NBA play preseason games against the ABA?
Answer: 1971 to 1975
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Beginning with the 2003 season, the AFL made a deal with NBC to televise league games, which was renewed for another two years in 2005. In conjunction with this, the league moved the beginning of the season from May to February (the week after the NFL's Super Bowl) and scheduled most of its games on Sunday instead of Friday or Saturday as it had in the past. In 2006, because of the XX Winter Olympic Games, the Stanley Cup playoffs and the Daytona 500, NBC scaled back from weekly coverage to scattered coverage during the regular season, but committed to a full playoff schedule ending with the 20th ArenaBowl. NBC and the Arena Football League officially severed ties on June 30, 2006, having failed to reach a new broadcast deal. Las Vegas owner Jim Ferraro stated during a radio interview that the reason why a deal failed is because ESPN refused to show highlights or even mention a product being broadcast on NBC.

After the TV deal, when was the start of the AFL season moved to?
Answer:
February