WGBH has posted two more updates as follows:
August 14, 2012
As of 12:30pm on Tuesday, August 14, WGBH 2 is operating at about 35% power on the standby antenna to help protect the tower crew from exposure to dangerous RF radiation while they rig the tower for the return and hoist of the repaired upper master antenna. Channel 2 should go back to full power on the standby antenna by about 6pm on Tuesday evening.
oops, a bit late on that one. And:
August 15, 2012
Work is again underway on the Needham transmission tower to prepare for the re-installation of the repaired upper master antenna.
Over the next two weeks, working at a height of over 1,000 feet, the crew will be rigging the tower and positioning lifting equipment, re-installing new lines and components, and hoisting and re-installing the 50 foot long, 16,000 pound refurbished upper antenna. Once the antenna is in place and operational, the crew will then remove the two temporary antennas and de-rig the tower.
The work schedule is dynamic and can change quickly because of many factors, including weather and how long each operation takes. To minimize the time on the tower and ensure they are prepared for the antenna’s arrival, the crew will take every opportunity to advance each stage of the work as quickly as possible. Because of this, when the crew has to reduce transmitting power and/or shutdown completely, there can be little to no notice.
Between August 15 and August 30, viewers should be aware that reception will have many periods of instability, particularly during the daytime hours when the crew is actively working on the tower. However, on Wednesday, August 15, WGBX 44 moved to an auxiliary antenna, which could affect reception for some viewers 24/7 until WGBX 44 moves back to the re-installed upper master antenna, currently planned for August 24-25.
WGBH 2 will mostly remain at its current power until the upper antenna is re-installed on August 21, though occasional power reductions during the day can be expected. The antenna hoist and re-installation work will necessitate all stations to reduce power on August 21. And by August 24, we expect WGBH 2 will move from its current position on the auxiliary antenna, back to its permanent home on the bottom master antenna.
We’re sincerely grateful for the patience and understanding of all of our viewers who have been affected by the antenna failure.