In the past few months however it appears signal at our house has degraded to be worse than what it was last year.

I have a HTC Desire A8183 that is now a year old, and has been great to me. However looking at it now with "No Service" on my screen is a regular occurrence, as it drops in and out of signal.

Now i've just dealt with this, because i don't call from my mobile, and texts just get delayed until it comes back online.

However someone else at the household who has a Nokia e75 has recently been reporting more dropped calls recently - they are on a contract and use it for business purposes. Today i tried to make a call from their phone and it took about 6 attempts to make a connection. They too have just dealt with it by walking into certain spots but have been getting more and more tired of it with 3 dropped calls today.
Additionally, someone else who has a Samsung C5220 also reported random signal cut outs, but has since changed to 2degrees.

Our house has never had good reception, but i never recall it being this bad. It was a low but fairly reliable signal. Telecom CDMA here is perfectly on the other hand, for the one person in the house that has not 'upgraded', despite the fact it appears to be from the same cell site, according to RSM.

On my Desire, signal fluctuates from 0 to 2 bars, or more accurately -99dbm to -110dbm (at this point it cuts out), but typically sits at -103 to -105. Putting my sim in a Samsung Galaxy S i9000T shows -97dbm to -105dbm fluctuation from a brief 20min window of testing, but appeared to be similar behaviour to the desire (the cut outs are random). This is all sitting in the same spot on the desk.

I understand there's no guarantee of coverage, but it's simply got worse than when i first joined XT. Obviously outside by the road on the property receives signal fine, as being indoors is what reduces a lot of signal. The house is typical weatherboard and gib, nothing out of the usual.
I contacted telecom today about this, and had it logged. They said there was some work on the cell tower recently, but I pointed out this is mostly irrelevant as i've been dealing with this for months.
Is there anything at all I can do aside from go through their typical troubleshooting procedure as I did? Apparently it will be passed onto the network team.

The cell tower is located in an industrial area and servicing our residential area. Between the two is quite a few large metal industrial buildings, which are quite tall.

I have a strong feeling that this will never be resolved and i will have to live with crap coverage unless i change network (not so for the person on the contract), but I thought it was worth a shot asking if the Telecom team here or anyone else had suggestions.