Help required to flash a new Radio on HTC Desire HD

I Have a DHD which i bought an year ago. It was rooted immideately after i bought it and i never really tried installing a new Radio until a couple of weeks ago when i flashed a new ROM...Android Revolution HD 7.0.3 and later Blackout ICS XL v2.0.
The problem that i am facing is
1. Constantly dropping wifi connection
2. fewer bars of the signal strength.

I figured that this could most probably be due to the old Radio(stock Radio) that i still have.

I need to update the Radio, but i reaaly could not find any consistent information on how to do it.

My Question:
1. Do i need to have Radio S Off and ENG S off in order to install new radio.
When searching over the internet, i got confused. Some say Radio S-Off is not required, Some say ENG S-Off is not required and some say both are not reuired to flash a new radio.

2. When i restart my phone in recovery, the hboot screen says ACE PVT ENG thats the information on ENG S-ON, but i really can't find a RADIO S-ON anywhere. How do i check this. My phone was unlocked when i bought it, i.e. it did not come bundled with any data carrier.

Please let me know, it will be a great help.

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