OK then I did the upgrade of the antenna, Mast Head Amp and ran Quad cable with F Type connectors . We are now running 2 SD boxes and 1 HD in the house mostly the pictures are fine with a little break up from time to time and when the guy next door starts his fork lift or a truck goes by, is there any thing else I can do or is that it?
Upgraded from what to what? (eg: make/model of antennas and amp you are now using)
The interference you experience from vehicles is probably a combination of two things... impulse noise, or reflection/blockage of the signals.
Your signal level/quality is probably low, which will have a poor signal to noise ratio (S/N)
The key to reliable digital reception is capturing a strong 'quality' signal at the antenna.
Amplifiers should only be used to overcome signal distribution losses (eg: splitting to multiple outlets) not just to try and compensate for a weak signal at the antenna, when a different antenna, or mounting location may provide better results.
All amplifiers amplify noise, as well as signals.
Just because you are within an 'adequate' signal area on the ABC digital signal coverage map, doesn't mean you will have reliable reception, due to several factors, like local terrain etc.
Is there anything else you can do?.. That depends on what has been done so far.
Have you had a site test performed and accurate digital signal field strength and quality measurements taken to determine the best mounting location and mast height for the antenna/s?
Has a site test been performed with different types of high-gain antennas specifically designed for fringe-area reception of Band 3 VHF and Band 4 UHF signals?
Are you using separate high gain antennas as above, with a fully-shielded diplexer, as this will give superior results, compared to a single combination antenna? (A masthead amp may have a bulit-in VHF/UHF dipelxer).
As I mentioned in my earlier post, without accurate signal measurements, the current status of your signals is unknown, so it's almost impossible to know what they are doing and if they can be improved.
More info on the antennas, amp and mounting can help a little.